Should outs in general are a hot topic of debate in the peloton community. For the bike and tread it seems that the majority of people like them. There is definitely a group of people who find it extremely distracting. I didn't like them at first but now they don't bother me and as I know more people in the community it's kind of fun to hear their milestones and get my own shout outs.
With over 1M subscribers and sometimes over 20K riders on a live class there seem to be way too many shout outs.
I bet they may start celebrating only the bigger milestones like 100, 500, 1000 and not 350, 1150, etc. I could also see them doing some classes that specifically have no shout outs.
I also agree there is no place for shout outs in a yoga class!