This question is an exact duplicate of:
The guidelines on moderating comments on main sites are well-established: comments are transient Post-it notes, they are second-class citizens, they can be deleted at any time for a number of reasons, and so on. However, those guidelines explicitly say "These guidelines are for main Q&A sites (not meta sites).".
Fair enough. So what about meta sites, especially site-specific meta sites? Should comment moderation follow the same guidelines? Or should comment moderation be "looser"? If it should be looser, what guidelines should be followed on meta sites?
I realize that each site and community might evolve its own culture and expectations regarding comment moderation on its meta site. But what would be a good default or starting point? Are there any guidelines or principles that are likely to be appropriate for many/most meta sites?