The Canon F-1 mechanical film camera from 1971 had over 10,000 parts. It was designed to compete with the Nikon F released 12 years earlier (with fewer parts) and despite the complexity was not really a competitive risk.
The Canon "system" (1) was designed to compete with the Nikon F system, which had 10 years of ecosystem growth.
Less than a year after Canon, Nikon released the culmination of a 5 year project, the F-2 (2), which overwhelmed Canon which barely resembled 1962 Nikon System (3).
Nikon took a very conservative approach to adding features having secured (and defended) the professional market. 8 years later they released the Nikon F-3 which *required* batteries for the *first time*, but even had a backup mechanical shutter release that was heavily marketed.