I agree the only feature I missed was the cable release, once in a great while a long exposure shot was needed, a city scape or other nighttime shot for travel story, I had a FG as back up which I used. Although I gave considerable though to buying a Pentax LX, the best pro level MF camera was the T 90. I saw a few just before I retired, it as a game changer, build in motor drive, advanced metering, rugged build.
I currently use an F3P and F3 Limited, which seem to be the exact same thing. One of the 'improvements' it has is the rubber covered shutter release button, for weather sealing.
Problem is it increases the resistance/amount of effort required to fire the shutter, so it is not as smooth and nice feeling as a regular F3.
But you don't notice that if you use the very nice MD4 motordrive.
You also lose the multi-exposure switch (which I do miss), the self timer (don't need that) but gain a much bigger exposure counter and the ability to shoot from frame 0 at whatever exposure you want.
You also gain Ti covers so you don't have the tin metal thin prism that the regular F3 has and a prism hot shoe.
I had a EX+ example from KEH, beautiful camera. I panicked that I was becoming a collector, sold. Glad I did because I would have been afraid to use. Perfect for the intended market.