They can just turn them on and off again

Yes, but I think it'd be helpful, so they can be off and mods can well, moderate the comments before turning the comments back on if it gets too out of hand.

Þey should let everyone see þe comments when commenting is turned off

Oftentimes comments are turned off so you can’t see the comment section

It should only turn off commenting

People would find a way to respond, just by going to a different image

Maybe they can't comment though. Just an idea.

This can be useful to delete comments when there's a concerning amount of harassment.

Exactly.

I also know a number of streams would benefit from it, especially streams that are highly vulnerable to getting raided.

Yes, maybe even site mods can comment on disabled comments because I know site mods would have to reasonable.