These people may be continuing private lessons and avoiding group social dances. This lets them focus on improvement while not exposing themselves in setting where there are large number of people. Statistically, this has a more favorable risk/reward balance.Now a few dancers at all levels, of all ages, come to dances and do their best in masks. Meanwhile, haven't seen many active, highly-trained, hard-working, enjoyable fellows for months.
In the meantime, by not exposing themselves at group dances, they minimize their potential for exposing their teacher. Teachers who specialize in private lessons in turn will want to minimize unnecessary exposure at public venues to protect their private students and their own business.
Meanwhile, around here, venues whose big business was always "group" are tending to start to open. Those group lessons tend to attracted more of the "moderately trained" who will, to a large extent, always remain "moderately trained". Yes-- some highly trained people sometimes show up at group lessons, but for the most part, it's beginner-advanced beginner, and terminal-intermediate.
I don't think I count as "highly-trained" .... yet. But I'm on the verge and may somehow manage to get ther. (I wouldn't if I only took group lessons). But as someone who is taking privates, there is no way I am going to group dances, bars, studio mixers and so on. Something has to be very important for me to risk being in a group.
I have decided to do a competition in November, provided it doesn't end up cancelled! So that's willingness to take a risk. But I still won't do socials mixer dances until death/new case rates are back to dropping in Illinois. I wouldn't be surprised if a number of people taking private lessons don't weight risk/reward something like I do.