Basic shooting fundamentals apply to both jump shots and free throws. They're similar. You're arguing they're "completely different". I'd like to know why you feel that way. The main difference, for what I can gather, is that with a free throw you bend your knees and propel yourself upwards to gain momentum/strength and on a jump shot, you jump and gain momentum/strength that way. The similarities are the basic principles and fundamentals, the difference is uh, not much? Maybe you can explain it.
I'll try and give it a shot. I can't really find a video or the place where I've seen it, but it was something like "Shooting Fundamentals with Isaiah Thomas". He was not explaining they are completely different(you do use your hands in both of them), however, he did say that they are significantly different. And I know I've seen guys that make a ton of jump shots and miss the easy FTs. The motivation behind this what he was saying was that you do not shoot FTs in a rhythm and you have to actually stop your whole momentum and focus. MJ was also sustaining the same thing.
We are, however, wandering away from the topic of this thread...
Everything is fairly clear and simple, this is a basketball manager. You want a good defensive team, train OD, ID, you want offense go for 1 on 1 and JS and JR. Why should you be able to defend a three pointer if you never trained OD, or if you have atrocious OD, well, you shouldn't. Why should you be able to be a leading rebounder if you never trained rebounding... the list can go on.