On the other hand, the F-35 is only stealthy when it doesn't use the points on the wing, so only carying 2 bombs in the inner bay. When you use external points for carrying additional bombs, the advantage for stealth is gone. So stealth is not an issue in these missions. or you have to fly 3 times as often as the F-16, or have 3 times more aircraft to deliver the punch. As it will be now, we only have 3 times less F-35's as we have F-16's so the that won't work. External carying it should be then, making the F-35 about as vulnerable as the F-16, but much more expensive.
A couple of points.
Even if what you are saying is 100% correct (and it's not, more on that later) then the F-35 would deliver two types of capability. Stealthy when needed, or not stealthy if stealth is not required. One aircraft with two very distinctly different operating capabilities, in the past that was the task of two different airframes, with associated duplication of costs. Specifically lets compare that to the F-117 and the F-16 working together.
From one operational unit you could configure the aircraft as needed for the task at hand, the first set of aircraft on target in stealthy mode, internal weapons only, to reduce air defense systems, the following aircraft, from the same unit, with external stores to handle everything else.
But the rest of it is that your statement of "When you use external points for carrying additional bombs, the advantage for stealth is gone" is not quite correct.
Reduced RCS is always reduced RCS, and lessens detection range. RCS is the sum of the parts.
Way over simplified here, but the basics are something like this: If the external stores on a specific aircraft angle (example on the nose) increases the RCS by 30 dBsm then it is the sum of the aircraft plus stores that make up the total RCS. If the basic airframe is 20 dBsm and the stores add 30 dBsm then the total is 50 dBsm. But if the basic airframe is 3 dBsm and the stores are still the same 30 dBsm then the total is 33 dBsm. The advantage in reduced detection and survivability is still to the stealthier aircraft.
Lets talk about that example in real world application, what does it mean, even though those are obviously not real world numbers. The exemplar 17 dBsm reduction would reduce maximum detection range significantly, the detection of the reduced RCS aircraft, even with external stores, would happen at much less than half the range of the non-RCS reduce platform with the same external stores. There would also be a REAL advantage to active countermeasures used by or to assist the lower RCS platform. The J/S (jammer to signal) ratio of a self protection jammer would increase by 17 dB, or the ratio would improve by a factor of 50. The same would apply to stand off jamming in support of the strike mission, there would still be a 17 dB improvement in J/S. This is like the jammer being used having 50 times as much power as it does. That is pretty significant.
So the lower RCS platform, with external stores and when compared to a non-RCS reduced platform with the same external stores, will be detected later on an ingress, and any supportive active countermeasures will be significantly more affective.
But survivability is not just about getting to the target, it is also about getting away. Once the weapons are away the pylons still increase the platform RCS, but the stealthy bird is now much more stealthy than the aircraft designed without RCS reduction in mind.
T!