As a former support group leader I can say it is a matter of participation. In my area, we could not credibly get more than two of us on average at meetings, over 36 months. we took polls, had flexible scheduling and really worked it, What we heard often was you do not have programing. Yes true, but in my area, we had one rheumatologist and one PT who might attend once per year. on those days we still had two (me and the assistant facilitator). It was just far to much when online groups can get 12-14 and attract top speakers.
Across the country it was the same thing in almost every area, except NYC, Minneapolis and LA. Big areas and each of those are doing online and in person as well.