That pretty much sums it up, there's a reason all of those custom ROMs pivoted to supporting basically just Pixels. Apart from Pixels, your only options are Fairphone and a few years old Chinese models (Xiaomi, Motorola, OnePlus), none of which are even close to state-of-the-art hardware.
Custom ROMs are pretty much dead, this just might be the final nail in their coffin.
Well, Pixel is arguably pretty shitty hardware as well
you don't need it, it's just a phone. Yeah maybe now, but in two years when the pixel is shitting itself you will understand.
If GrapheneOS dies, that's probably it for me with pixels. The only advantage left is how cheap you can get a new flagship pixel on the gray market.