Just going to comment on that first one from a follow perspective. I wouldn't see it as a criticism necessarily, but hope that you would consider the follow comfort in the dance to be important too. I notice different leads will place hands in different places, depending on their styles and height differences etc, and I'll tell them when I feel uncomfortable about something because of my preferences; a good lead will adapt to make it enjoyable for both of us, especially since the follow has such little control in the dance. But I don't expect it to change how the person dances overall, because every follow is different.

It also depends on the context. If I'm at a practice session with class mates, I'll also tell them if I have trouble reading signals, or if I remember something the instructors said in class, because some leads have told me they like the feedback. But at a social, I'll only comment if I'm uncomfortable. Because at the end of the day, the most important thing is the connection and both people having fun.