Unpacking a lot of this and I actually agree with most so I am just expanding on it.
No rule I'm aware of, but IMHO interesting what-if scenarios are alternative choices people at the time could have chosen with the information they had at hand then. With hindsight we can then speculate whether said choices would have been more or less fortunate than the historical choices.
Agree there is no "rule" but without some constraints we can wind up with Nuclear Carrier with F-14s at Pearl Harbor
There was a lot of information from WW I and the 1920s and early 30s but the "experts" did not always agree so it is sometimes not new technology but a different path.
For the army was WW II going to be a repeat of WW I with slightly better tanks and aircraft or was there going to be a different way of fighting (no more massed charges?).
Well, people at the time weren't idiots (or well, some of them were, just like some people today are idiots).
Still, there's many things they could have done better, even with the information they had then. Or making larger R&D bets on things which later turned out to be huge isn't implausible either (radar or jet engines, for instance).
Sort of a repeat. You also had some "empire building" going on in a number of nations were the Air Force/s were trying to either become the dominate force or were trying to at least achieve parity and not be an after thought.
By the end of 1918 the British had a very good idea of what worked and what didn't against submarines (given the technology of the time) and this goes for both surface escorts and Aircraft and types of patrols. However this didn't fit the narrative that some air force advocates were trying to push (The Air Force could win the war by itself) and 'defensive measures' like anti-sub work was not winning the war with offensive bombing.
SO yes, there were a lot of bad ideas/policies enacted that hurt procurement, doctrine, tactics and so on.
I've read somewhere that the expectation wasn't that heavy AA by itself would cause heavy losses to attackers, but would break up formations making it easier for the light and medium AA to defend the ship against individual or small groups of attackers at a time rather than the entire formation all at once.
Might be that wartime experience showed that this idea wasn't worth much against experienced and determined attackers.
Everybody thought that AA would be much more effective than it was. Of course some people thought that anything bigger than a 500lb was a waste, despite the British having 3 different studies of bomb damage that said otherwise. There was also around a 10-15 year pause in aircraft technology.
This was the 'standard' British bomber of the early 1930s. Some served in aux roles until in 1941? but some were replaced in service squadrons by the first Whitley's, Wellingtons and Hampdens. Also note that while the several WW I British fighters that could do 130-140mph it took until after 1930 to get a service fighter that could go over 200mph.
Germans kept these a secret for several years in the early 30s.
A claimed top speed of 160mph, perhaps with a tail wind?
Things (speed and altitude) started changing a lot quicker in the mid 30s.
I'm not sure that's the conclusion to draw. Guided missiles weren't an option during WWII (or could they have been, given a massive R&D project, maybe an interesting what if scenario?!), so shooting a huge number of shells to achieve a result might still be a better option than doing nothing.
I have big, big problem with anything that requires a major shift in time for electronic capabilities. Electronics were undergoing a rapid shift in development in the 1920s and 1930s and 40s. We can argue if it was as fast as cell phones were developing in the last 20-25 years

Portable radios (that did not need a truck or ship) were showing up in 1917 but a lot them were heavy, used dry cell batteries and sometimes only had ranges of around 6000meters even in an aircraft. The British army went through at least 3 tank radios in the 1930s to 1940 when the No 19 set showed up, there some tweaks to the No 19 but it lasted until the mid 50s.
Some other armies and air forces showed a similar pattern. In just a few years a radio could offer voice communications at longer ranges than a older radio could offer code/key communications, which is why so many late 1930s aircraft had a radio operator (as did tanks). Voice communications over radio was not possible over long ranges in a radio/antenna that could be used in a small plane or tank.
Drawing of a Defiant fighter showing the radio masts/antenna
Somebody had to crank the antenna/masts into position after take off and raise them before landing.
As far as firing off electronics as rounds of ammunition goes. It is often said that the proximity fuse program cost more money than the Atomic bomb program. This maybe subject to debate but the idea that working guided missiles only needed the "idea" and little effort to get rid of Battleships and Cruisers in the late 30s or early 40s doesn't hold water.
Even 1950s missiles were found to have a hit rate of 5% or under when actually used in service conditions, not tests firing, often done/assisted by manufacture's personnel.
And in the 1950s the electronics industry was much more advanced and commercialize (large plants) than it was in the 1930s and early 40s.
en.wikipedia.org
gives an idea of US experiments with a reverse engineered V-1 that lasted until until 1953. It also details some of the bickering between the Army and Airforce (and Navy) over who should control such a weapon and it's kin.
It also a lot easier to design a missile to attack a sizeable ground target than cannot move vs ships and aircraft that can. By 1944 radar aimed AA batteries with proximity fuses were using 1/10 to 1/ 100 the amount of shells they were in 1940 to kill an attacker. Need for guided missiles for AA work was a lot less. USN had a different requirement, after late 1944 they needed to stop Kamikazes which were sort of flying guided bombs (guided by pilot) and they had to be destroyed while incoming.