Yes I agree with what you said, but you cant make them stealth anywhere near as good as an f35, much less an f22. I know they have the SE version but theres only so much you can do. They can be improved but only so much.
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If you want real stealth you have to design it in from the git-go. Stealth wasn’t an item when the F-15 airframe was designed. Small mods possible but you’re correct, not much can be done.
Fun stuff: The F117 was designed using modifications to Maxwell’s curl equations describing radio-wave behavior. The guy who did the study and updates to Maxwell’s equations was a Russian mathematician, Anatoly Dnieprov. Lockheed Skunk Works took Dnieprov’s work and developed a computer program named “Echo” (if I remember correctly). The F117 airframe was basically designed by electrical engineers.
That’s the second time we really snookered the Russians. The first time was buying the titanium for the A-12/SR-71 programs
You Take Care..
Exactly. The earlier planes didnt have stealth (at least not in the way the f35/f22 did as a huge design requirement) in their specs. So maybe theres some room for improvement, like we see in the f15se, but its limited. They are still a car, compared to a bird or fly.