SilverWook said:
The point I'm trying to make is that the TIE is a successful design. Like a B-1 or a B-52, you can upgrade the electronics in the cockpit, and even the engines, and it's probably going to look pretty much the same on the outside.
Judging from ROTJ, it seems that even at that time TIE Fighters were being replaced by TIE Interceptors.