Android

I have absolutely no Google services in any of my devices

Well, that misses the entire point here. µG is "Google services", just a rather minimal implementation. You're talking about an entirely different scenario.

while it is true that Google can still see a lot of what goes on in my browsing, they cannot point any of that browsing to me, because I do not exist for them anymore.

They sure can. The identity may not have your clear name attached to it but that's of little relevance; it's still linked to you. Pseudonymous != anonymous.

There's tonnes of ways to map between pseudonymous profiles and real names if you wanted to but there's no real need to do that as they can deeply violate your privacy for immense profit without any clear names involved. That's the perverse thing about these data krakens.

I’m sure they do keep the data they gathered from me when I used Google accounts, and there’s little to nothing any of us can do about it, so stopping providing them with more personal identifiable data is the next best thing we have.

The Google accounts' data itself should actually be deleted if you're in a jurisdiction with half-way effective privacy laws. The shadow profiles they collect on you to this day however...

One of the advantages of having Unbound + PiHole/Adguard home, is that caching DNS, keeps most requests within my network for the translation to IP, so while my network does have to go outside every now and then to refresh translations or to get non-existing ones, it’s minimal in comparison to the regular user.

It's by no means a bad setup but I don't see much of a privacy win in it w.r.t. outgoing connections. Such DNS-based tracking outside of your home network simply isn't a huge data leak if you're not using known-malicious DNS servers and those can be changed using one dead-simple setting present in pretty much every SOHO gateway.