Sure, look I don’t know enough about this to contradict you but I’m not sure “GS are part of the ROM” is the whole story. The components in question like com.google.android.gms are just components, it’s just that a lot of other components rely on them. If you remove them it’s going to cause problems, but as I understand it the purpose of the microG suite is to mitigate those problems?
I’m not sure I really have a specific goal. It’s a second / unused device so I’m just playing around with it really. I’ve always wanted to try Lineage but it’s not directly supported and I think there’s problems with the Camera amongst other things. I was reading on xda-forums someone said they rooted, installed stock android, then lsposed, and microG, and found the end result to be very pleasing, so I was just kinda following along with that to see where I end up.
I think in summary I’m interested to see what sort of experience is possible without any (minimal?) google services or apps.
I’ve updated the post since your first comment, I found a guide that I’m going to work through. I’ll let you know.