I can suggest edits on main but not on meta. "edit" is grayed out and not available. Is there a restriction due to low reputation?
I guess one thought would be that edits on meta don't really have the same meaning as editing a question or answer on the mainpage. And of course you always can request somebody make their post CW if you think it could really benefit from community input. Otherwise comments/answers are probably the way to participate in generating consensus around things on meta.