It was a ballsy move by Canon to abandon the FD mount and adopt the EF mount. Who wouldn't've wanted to observe all the boardroom decision making at Canon Headquarters for that?
Yes, they took a short term drop in loyalty and consequent sales, but their decision was ultimately the correct one (*). To this day, any EOS body made between 1987 and today works perfectly with any EF lens made between 1987 and today.
With Nikon, there's an approximate 20-year sliding window between bodies and lenses where you have perfect compatibility. When either a body or lens exceed that range, there may be some loss of functionality. Thus we have these indispensable charts, the best on the internet:
http://www.kenrockwell.com/nikon/compatibility-lens.htm
(*) alas, if you're fond of smooth weighted manual focusing helicoids and having real aperture rings, then it's not.