In 1987...
That's not comparable. Canon was in a different position, both in terms of technology and marketshare, and had to move fast to a new mount. The FD mount AF T-80 proved to the engineers that in-lens AF motors were the future. But it also clearly proved that the FD mount wasn't viable with AF. With Nikon and especially Minolta moving aggressively on AF (in body motors) Canon had to do something radical.
Today? Canon is the market leader and the EF mount remains one of the best out there. Mirrorless is a valid market but hyped way, way out of proportion to its sales. The market feels, as you do, that OVF and DSLR ergonomics are still better. Someday that will no longer be true. But not so soon that Canon has to make a radical shift.
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