Before getting a pixel with calyxos, i used a moto g8 with lineageOS. It was pretty good but you couldn't lock the bootloader after reflashing which is a bit of a security issue. With the pixel the best part is you can relock it after flashing custom os.
Discussion
How do you re-lock?
Does that get rid of the weird bootloader screen?
I followed this: https://www.paulligocki.com/installing-calyxos-on-the-google-pixel-6a/#Re-Lock-Boot-Loader
There is still a weird boot screen saying the phone is using a different OS.
Note that locking the boot loader will wipe your data if you already used it.