Melanie, I fully agree with you, but there is no way to know why some people no longer post on g2g, some people have left wikitree, etc. It isn't always because of the new Discussion Rules, especially with everything that everyone is dealing with around the world this year.
I made a statement that I, personally, have seen less MIRs coming through the Mentor area for G2G related issues. Who knows why can not be determined because most people that are referred to the Mentor group are referred once, understand what should be changed, and they are not referred again. To me, the number of MIRs that I saw being referred was always very small for G2G related issues. It is normally about sourcing issues, merging issues, or trying to help with differences in a profile.