The F didn't really had a "first", it's distinguished by being "the first" to bundle a lot of previous developments in one reliable package. (The F system did

The F didn't really had a "first", it's distinguished by being "the first" to bundle a lot of previous developments in one reliable package. (The F system did follow the pattern of most contemporaries to design stuff so that it would do what is needed now, with little regard for future developments. That's why Nikon introduced Ai (and then very shortly after that, Ai-s) mount variations, or why Canon had like five variations of the FD mount; almost all companies operated like that, with very few exceptions such as Konica AR)