Not a problem. Google Play is still available, with all apps you have today. If you want to run that, then it works allmost like stock but with more control over everything. Only thing missing is Google Pay and I strugle with RCS messages. I never use SMS so I don’t care about that one and it could be just me.
Alternatively you can run Google Play Services in a different, sandboxed profile if you’re going for privacy.
Which I think is good. Make it easy for people wanting to test FOSS to do so.
Anyone who knows what they are doing will figure out how to install F-droid soon enough.
I find it hard to critisize it for something that makes it so much easier to start with for anyone.