Lol at the microwave curry stroke. We've all been there :embarrassed2:
I think people confuse 'secrets' with 'technique'. Technique can be taught and learned, but it can developed naturally too, through practice. How quickly and naturally your technique improves is down to natural ability. Those that need to be told to do something as elementary as keeping their head still are going to need all the instruction they can get, and should be grateful for it.
To be fair, even very advanced players have things creep into their technique that they're not aware of...it's always helpful to have someone point out that you're raising up or twisting or whatever...I had a kid tell me (I've been playing since his father was in middle school) that I was jumping up on my shot...I really had no idea (it was very subtle), and immediately squared that away. I was glad for the assist. As for technique, I learned most of the cool stuff from road players I donated to back in my weak gambling days. I'd see their CB do something that I couldn't pull off, then I'd ask...or I'd get them to show me how to measure two rail kicks, whatever. They almost always obliged me and taught me the method.