In this aspect, Nikon is a little misleading, because it puts the count also your old lenses, manual focus. On the other hand, Canon only makes counting their EF lenses, which started production in 1987. Canon took a bold attitude when he abandoned the compatibility of their previous camears and lenses to exclusively support EF lenses in 1987 to enable faster AF and silent, and compatibility with AF in video, after many years.
As somebody who had a significant MF Canon system in 1987, I'll add this:
First, in 1987, the F1 and T90 were still the premier Canon professional models. It wasn't until the EOS-1 was introduced in 1989 that AF Canon was taken really seriously by professionals. Reportedly, the T90 and EOS-1 development occurred in parallel, with the exception of the EOS-1 AF circuitry.
Second, There was a lag in filling out the professional EF lens lineup, something like Fuji X-mount users are facing now, only Fuji is doing a better job of it than Canon did.
Third, A lot of us expected Canon to introduce focus confirmation capability into its MF line, something like MF is done with current EOS lenses. It never happened. If it had, a lot of us might still be using MF systems.
Fourth, Canon explicitly stated that one goal with the EF mount was to enlarge it. The FD mount was the smallest diameter lens mount used by any major SLR manufacturer. The Canon 50 f/1.2 was offered as an example of a lens that could not be made using an FD mount.
Correction: It was the 50 f/1.0, not f/1.2 that couldn't be done with the FD mount.
Fifth, both Nikon and Minolta (Sony) originally put the focusing motor in the camera body. Canon put their's in the lenses. Suffice it to say, Canon won that argument.