That's just your opinion. This "tanker" is the biggest manager on BB, and we can all learn from him.
If you want to be the best, learn from best, or you can try to invent hot water and try your own thing, but don't teach other that way and say it is the right one, because people can see what works.
All of those skills are important, and you should not sacrifice any of them, find a balance and train them all.
If you don't want listen to champions, then you should read what BB-s say.
Point Guard
Primary Skills: Outside Defense, Passing, Jump Shot
Shooting Guard
Primary Skills: Outside Defense, Jump Shot, Jump Range
Small Forward (Outside Based)
Primary Skills: Outside Defense, Jump Shot
Small Forward (Balanced)
Primary Skills: Outside Defense, Inside Defense, Jump Shot, Inside Shot
Small Forward (Inside Based)
Primary Skills: Outside Defense, Inside Shot, Inside Defense, Rebounding
Secondary Skills: Jump Shot, Passing, Handling, Driving
Power Forward
Primary Skills: Inside Defense, Rebounding, Inside Shot, Jump Shot
Center
Primary Skills: Inside Defense, Inside Shot, Rebounding
Secondary Skills: Handling, Passing, Jump Shot, Shot Blocking
So yes, he should definitely sacrifice the
main skill on almost all positions to train more secondary and tertiary skills, thumps up for you mate.
First learn, then teach other, my advice for you, best regards mate.
This is where we hold them!