The Canon mount is completely removable Like this:
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The Sony 70-200 and 200-600 collars are not removable. The foot itself can be removed, but it leaves a mounting bracket sticking out (and since that bracket has a 1/4”-20 tripod socket, even with the foot removed the collar is still a tripod mount).
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Having a replaceable tripod foot on a non-removable collar is fine for a large lens like a 200-600, or a 600/4. IMO, the quick-release Sony uses is nice (assuming it doesn’t introduce vibration) but unnecessary. How often do you pop the foot off?
Canon provided two interchangeable feet for my 600/4 II’s non-removable collar (for tripod vs monopod use). I use the RRS foot instead, but I don’t think I’d ever want/need/be able to use the lens without a foot of some sort installed.
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However, with a relatively small and light lens like the 70-200/2.8, the ability to completely remove the tripod mount is an advantage.