I am often reminded that there are multiple personality types showing up in many things, such as software.

To my personality type, I would wonder why you wouldn't want a replaceable window manager, and I consider a reaction like yours to be the product of some kind of odd software design authoritarianism.

But we're not both right or both wrong, this is just a point where we differ.

PS: a bunch of those desktop environments you cite are not actually window managers.