I like open source too, but I'm not serious about it, I want to be able to fix things or file an issue on GitHub or whatever if necessary, but I don't have the energy to worry about proprietary blobs.
Having control of my phone and its configuration like I do my Linux desktop is what I want, but I'm slightly resigned to perhaps not getting it because of app support (I tried Anbox on my desktop, it was buggy and slow, with a fraction of the RAM I dread to imagine) - so I've been thinking about and occasionally working on a Terraform provider for Android instead. So far I'm using it to install all apps, no Play Store at all; I'd like to have it handle settings too.
So yes, it is Linux more than OSS that appeals to me here, because it's control more than openness that interests me in it. (I suppose some wouldn't see a distinction, and that's partly why it is more important to others.)