Flat spot on head - did you regret not doing helmet ?

My son is almost 5 months old and has a mild (according to PT) flat spot on the side of his head due to torticollis. With the help of a PT, we were able to intervene early enough that he only has a slight difference in his forehead and ears (when we first started, the discrepancy from one side to the other was incredibly noticeable).

We are now at the point where we have to decide if we want to do a helmet. I know it's a completely personal decision...but I would love to hear from parents who faced the same situation and decided to forego the helmet. Did your babies head even out more over the course of the first year ? Did you regret not doing it ?

TIA !