That's a solid argument toward using an AVP vs a traditional PCVR set up.
... So why not just do that for a fraction of the price on the Quest 3? I do everything you listed on mine, I even take it with me when I travel without any perceived constraints. I, too, can use Steam Link (although I prefer Virtual Remote Desktop currently) and even found myself making some use of the new Xbox GamePass app, and yes, it also pairs with my controller, and my Logitech keyboard and mouse too.
I understand the AVP can fill a wider role than a standard PCVR gaming rig set up, but I feel what you describe as something to compare with the AVP is honestly kind of outdated.
I imagine it'd be handled kind of like how McDonald's "1,2,3 Dollar menu" doesn't have a single item under 2 dollars in my area.