As a bit of a segway in all of this the ol' gem of decision making comes up.
I'm one who sits decidedly in the camp that this is seldom a quality that can be particularly improved, as it applies to this game.
There is inherently, for mine , an erroneous belief that action and decisions are necessarily cut from the same cloth .
Whilst it's very possible to train players to act in a certain way, take a particular course of disposal etc they aren't so much 'decisions' as learnt automations.
True decision making sits above all that. It is imho a DNA like quality. I E you either can make very good snap decisions...or you can't. I don't think it's something capable of being 'learned'
In that regard players who might have desirable qualities and abilities but poor decision making often stay exactly like that.
They might become better players simply by becoming better automons...but not by considered action.