Originally Posted by Raul_SJ
Why do you think they missed spotting it? Were they experienced coaches?
I think it partly comes down to philosophy and that coach's personal experiences. I'm sure some coaches prioritise different things and like to approach the serve in different ways: some with kinetic chain specifics, others more holistically.
I'm doing some coaching more seriously now and the first thing I concentrate on is good contact in that area - precisely because of the problems I had as a player.
I also think that coaches can easily, and justifiably, get manoeuvred into giving guidance which feels 'substantial' and 'worthy' of their hourly rate. Not many students would want to spend 50% of their lesson doing fence drills and pronation drills even though it might be best for their game.