I have to agree with VG-33.
While the defense industries may be a bit overblown it does address the question of logistics, which for fleets is more than just fuel supply.
A number of British ships shot out their 4in anti-aircraft barrels both in Norway and Crete. They needed new barrels or barrel liners, not just more ammo.
with German, French and Italian ships all using different guns with different ammo ( at least 3 different types of 37mm ammo if not more) keeping them in action after more than one or two engagements becomes a real problem if you have moved them from their normal home ports.
Battleship guns had a service live of about 1 1/2 to 2 times the capacity of the magazines using full charge loads. Some countries did better, especially with reduced charge shore bombardment loads but that is not what we are talking about.
Once you get into different radios, fire control equipment, and especially machinery even if the original factory making the parts is still in existence moving the parts to new bases or suppling parts to a mixed fleet becomes a real problem.
The captured French fleet poised a real problem but it was not a long term in action problem but a fleet/threat in being problem. British had to guard against a one or two time use at critical points/targets.
The British can also afford to trade ship for ship against the Germans, Italians and French. At least until the Japanese join the war.
Historically the French can offer 5 battle ships to the Germans.
The Corbet and Paris had escaped to England leaving only the demilitarised Ocean/Jean Bart which would have need much work to turn into an effective ship.
Of the Bretagne class the Lorraine was interned in Egypt leaving the Bretagne and the Provence. These two , are at best, equal to British"R"s.
This leaves the Dunkerque — Strasbourg pair.
While the Richelieu might have been gotten ready without too much trouble it is rather doubtful the Jean Bart could have been operational for year or more (perhaps never with suitable delays by French dock workers?).
While worrisome or troublesome such a number of major Ships do not really Shift the balance of power that far. With the Scharnhorst out of service for months with a torpedo hit and the Bismark not becoming operational until the spring of 1941 opportunities for coordinated actions seem remote.
After the Battle of Taranto the Italians were not in a good position either. Combining the French and Italian battle ship fleets gets about the same numbers as either one had pre-war.
There are more to a navy than battleships but There are reasons that many French and Italian Cruisers were referred to as "tin-clads"