True, although using adb requires the use of the usb port, which for some of my projects is highly impractical.
Also, with this move, Google has made it very clear that they don't want people to have any real control over their machines -- so I'm not inclined to think that using adb to work around the problem will always be possible.
It's fine, though. My hobby projects will continue into the future, just probably without using Android.
I know that this is how shizuku (0) does it and it is required anyway if you want to install multi apk applications so stiff won't change for most people then?
Play Store has an attestation API, Google could simply make it harder to run banking apps and similar if you run GrapheneOS. Something like requiring banking apps to use a stricter mode. GrapheneOS even mentions it's not easy spoofing this entirely as it change often on the FAQ page.
There's only so much you can do as a maintainer of a custom OS like Graphene before its too hard to maintain. I don't think there's enough coming in by way of donations to play catch-up.
Need legislation quick. But I suspect the EU doesn't want side loading either in the grand scheme of surveillance.