A good stroke development coach trains their eye to see where the true fault is coming from. Is a dodgy kick the kick or is it actually an incorrect head position? A great stroke technician knows where the muscle initiation is for a movement and can turn that into fun and games for their student. I think stroke development is one of the most fun places on the planet.
There are as many ways to teach swimming as there are swim teachers. Consider our teaching library a smorgasbord. Feast on what you love, and what you don’t love, just leave on the platter for someone else.