Pixel phones currently have the additional benefit of a full Debian OS running via AVP. This is (imo) on par with or better than having Termux on a rooted device. It's still fairly off-the radar which makes it a really good time to be exploring it's uses.
I agree, it has been lots of fun testing around in the KVM. Recently a GrapheneOS update even included the Button to attach to the "screen" of the VM. It also has GPU passthrough iirc?
When i have more freetime during the holidays i will test further. I especially want to try how it works when i combine stuff like steam + fex + Proton or run other GPU stuff