I agree, it' was unfortunate that they waited for a few years to bring out the XK Mot, during that time they lost a lot of their cache to Canon and Nikon. The XK's were extremely advanced for their time and in reality still offer incredible specs to those that use them.

Previous to the XK, Minolta did make another motor driven camera it its "S" series but it was also a special body....the SRM..


One of the drawbacks to all of the older "flagships" that had motor drives, with the exception of Olympus, was their weight...they were all bricks.
I think we take for granted how far cameras have come since those days, 3.5 fps were considered fast for a pro camera and both Canon and Nikon offered special built models capable of up to 14 FPS, now newer mirrorless cameras boost frame rates approaching that of video speed and sometimes faster in burst rate.

for Nikon shooters

Best, Ben
BTW, Original Pentax called Spotmatic also had to have a special body that was made for a motor