I agree with both of you.
(Although I will admit I find myself using knife hand on a daily basis… instead of pointing with my finger I use knife hand by default now)
When I was younger, and all that I had seen was recruit classes according to Hollywood, I thought the gratuitous amount of yelling and PT was an important component turning recruits into real soldiers.
And there is a component of that.
But I agree, more PT & more time spent learning will ultimately be of more value than just getting screamed at ‘just because…’