Personally, I think Facebook is a terrible choice. User information there is not protected and is monetized. As a discussion forum it is useless. It is ad laden, tracker laden and not user friendly. I don't have a Facebook account anymore and I am not interested in getting one.
This forum email list works fine for me. If we need another email server there are several in the amateur radio community to chose from, including TAPR. If we want a commercialized product, there is groups.io which has a large community of ham radio related lists, mostly migrated from yahoo.
Just my opinion.
73 de bill K7WXW