I mean, that’s your definition of “yours” though.
It’s like saying that buying a condo isn’t home ownership due to an HOA having some oversight. Some people are totally fine with that, it doesn’t mean it’s less “theirs”.
I would in fact argue that exact point.
How much you control something directly relates to how much you own it mentally and practically.
Desktop Linux is not as nice or facile or polished, but it feels like "my" desktop because I can modify it. When I use MacOS, it feels like I'm just renting somebody else's computer. It's a very nice computer, but it can never be mine.