AES is needed on top of XTS to unlock a disk with FDE enabled and evdev is used in osk-sdl to input the passphrase.
While zram has uses outside of swap-on-zram, I would believe that the main use of zram in postmarketOS is swap-on-zram. In addition to that, I imagine many probably expect swap-on-zram to work if the zram kconfig succeeds.
Device kernels that enable zram support can use `pmb:kconfigcheck-zram` to protect against kconfig regressions that disable support for zram.