In answer to my own question, I am in the “practise” camp. (I can even spell it some days).
I believe everything I read and it does have a positive effect. Did a bit of skills training recently too. Right now, I am forcing heels and wrists down and trying to make it natural. On the way to work every day, up down kerbs, down sets of steps etc etc even if I cant get a proper session in at the woods. I have even stuck my brake levers up unnaturally flat to try and force my wrists down while braking.
I was interested because I have riding Mates (who are very good) who never read the manual, never go on the skills course and wouldnt dream of spending a morning on one technique!
Off to standish woods tomorrow. There is loads in a tiny area and my wife has stolen my free time. Bless her