Speaking from experience, matrix is still kinda rough around the edges if you have a 100+ person group with non-technical users.
More broadly, pretty much all of the secure messengers currently have an ~O(N^2) problem with state sync in groups. The only one that isn’t deeply frustrating is Signal and that’s largely because it has very few features and can’t be self hosted.
Speaking from experience, matrix is still kinda rough around the edges if you have a 100+ person group with non-technical users.
More broadly, pretty much all of the secure messengers currently have an ~O(N^2) problem with state sync in groups. The only one that isn’t deeply frustrating is Signal and that’s largely because it has very few features and can’t be self hosted.