The problem is that even if you build this yourself, and sign it with your keys, the signature of the builds will not lead to positive hardware attestation. This, as noted by @palata, is required for passing Play Integrity Checks, and in turn is the requirement for using banking, tap2pay & co.

It's really a bummer that Google probably won't certify pre-rooted devices. It would obviously only do harm to them and not fit into the scheme of our big tech companies pushing anti-circumvention laws, but some high-spirited side inside of me still has hope.

I'm not using those. Would be cool if I could access my own data and lie to software vendors about that, but I'm not very interested in playing that game every time they release another update for the detector. I'd rather use free software and have a free device. The apps I use currently on Android have no problem with root