Agree with all this mase. Also just like to add that the lack of a opposite foot often put pressure on the kick. Hewitt was a prime example. Often got out of tight spaces because of the confidence in his left boot. Sam Mitchell was another. Shits me to tears the lack of an opposite side players have these days and I can only put it down to the junior training they get.I think what most people miss is a lot of these guys under no pressure are good kicks. It’s often only exposed when they are put under pressure and then we find out whether they are a good kick at AFL level.
At AFL level you get less time to dispose of the ball so it can expose a number of weaknesses in a players kicking ability including speed of decision making, how tight their kicking action is to get ball to foot fast, fluidly and accurately, things like actual athletic attributes like leg speed (as in the swinging action) and even confidence etc
It’s often not about them not being taught to kick properly. Some of these things can be overcome by players playing within themselves, knowing what they’re capable of and executing within those confines.