I've been using grapheneos for two or so years, I think using some non-foss apps is probably non-negotiable if you want a functioning phone. I personally only use one profile (+ the private space), but separating stuff out isn't a terrible idea. Knowing that play services are sandboxxed away and that I have much finer control over per-app permissions makes me less concerned about letting corpo stuff cohabitate.
However, I recently learned that GOS recommends Play Store before any FOSS app stores.
As for this, basically the gos devs are just kinda indiosyncratic and have a lot of opinions, I wouldn't worry too much about it if you know what you're doing. I use fdroid for most stuff and I've never had any issues.


It's crazy how fast bun went off a cliff but not surprising for anyone that's been paying attention