I agree with some of what she has said, but not everything
MacColl, sat like that for a reason, it is not about posing but posture, a similiar idea to Prof Alexander, posture and breathing exercise improve your singing technique., and his preparation and professionalism is something that is worth giving some thought and study too
MacColls singing technique was much better than Shirley Collins imo.
Shirley Collins is a very nice person and a singer whose performances I have enjoyed, I agree with her description of MacColl as being rather domineering, he was also someone who was happy to give help and time free of charge, and who formed the critics group to try and help younger singers.
People are often complex, and who have good and bad points.
I think theabove is a fairer description. Dick Miles