I feel like the heavy weapons are a gap in the design where they could really make some meaningful changes. It's immediately obvious that neither Psycannon or Psilencer are good at... really, anything, especially when our starting point is a Storm Bolter. To cut the story short if these troops are giving up a NFW and SB for a (short ranged) heavy weapon that weapon had better be good. We shouldn't be begging passing Space Marines to lend us whatever standard old Lascannon platforms to pick up the slack that the GK weapons are leaving.
I bring it up especially because nobody else has them and so this can be fixed with just a new statline for those weapons in an FAQ/CA/whatever.
Besides that I think others have gone over it pretty comprehensively. Not much to add.
