Even just being rooted on the stock Pixel rom is a fight. It's a constant cat and mouse game to pass basic and device integrity, but as of recently a lot of us have been able to pass strong integrity as well which has been nice.
Even just being rooted on the stock Pixel rom is a fight.
That, I can see being more of an issue than an unmodified, trusted 3rd party OS. If I remember right, rooting makes the device fail Verified Boot:
It establishes a full chain of trust, starting from a hardware-protected root of trust to the bootloader, to the boot partition and other verified partitions including system, vendor, and optionally oem partitions.