Pinball is inherently random. Having or not having an understanding of the rules before playing a ball may or may not affect the outcome of the game. But a player who is currently playing the game and has achieved a certain state in the game must make that decision of what to shoot for themselves. If they are trapped up and someones says “shoot the scoop” that is coaching.
For arguments sake, let’s say they finish ball two, walk away from the game and someone says “you should have shot the scoop”. On ball three there is no guarantee that they will get the ball under control and be able to shoot the scoop.
IMHO there is also a huge difference between being told a rule, and knowing the rules well enough to be able to make split second decisions about where and when to shoot the ball(s).
I will usually be happy to tell an opponent anything about the game before the game starts (they still have to execute). I’m less likely to offer detailed game info after the game begins.