A personal gripe as well is the inability to claim games that are free, like you can on other platforms. I have a lot of games in my collection that will likely stay in a collection instead of my library until I get space to install them. It’s just a preference thing though, I don’t expect anyone else to share it.
Free games that are claimable is something developers must host as a promotion for if they wish to offer that. By default, a game being free does not mean you permanently own it to allow developers the ability to update what they’re offering.