I didn't mean to imply that lower fidelity planes = lower pilot quality. As a matter of fact a lot of the FC3 fighter guys are way better than I'll ever even hope to be: when I try to go toe-to-toe with an 'average' F-15 pilot he usually wipes the floor with me in seconds, which is why so far I've stuck to sneaking past them and clubbing helpless A-10s. Those extra radar modes would be helpful for finding and attacking enemies without a doubt. That said, in my opinion the F-15's excellent flight performance and superior missiles are more important than the finer points of its radar capabilities when it comes to success in-game.
As for the TWS, my comments were based on my personal experience on the 104th, which is that I almost always get a lock warning from the RWR before attacking F-15s launch their BVR missiles.
AFAIK a shot using TWS doesn't produce a lock warning on the RWR until the AMRAAM goes active. When I get locked in the MiG-21 I usually respond with an immediate dive towards terrain masking- If the lock was a result of a slammer going pitbull I would be dead long before I got into cover, hence my observation that most F-15s don't seem to use TWS, at least when they have only one enemy plane on their scope.