Kernel Configuration: SquashFS and MTD Write Support

I'm going through the default settings for EdgeRouter X, and am noticing two things in particular:

  1. kmod-fs-squashfs is not selected.
  2. kmod-mtd-rw is not selected.

For #1, I'm building a SquashFS image, so isn't that a requirement?

For #2, won't sysupgrade fail to function if I don't have it? I thought it used MTD. If I don't have this, am I not locked out of writing to MTD? How important is this module?

EDIT: Nevermind. I'm following directions that say to run defconfig then menuconfig. I found what seem to be the right directions.