For example, if you are going to fly VFR, you need to predict whether or not there will be any clouds in the way since it’s not okay to fly into them (or too close to them) under these flight rules.
Pilots that are learning to fly are required to learn aviation meteorology.  The simple reason for that is so that a pilot can predict as best as possible whether or not there will be any adverse weather issues during the flight.  For example, if you are going to fly VFR, you need to predict whether or not there will be any clouds in the way since it’s not okay to fly into them (or too close to them) under these flight rules.  Also, being able to predict turbulence is a big deal, particularly if you’re going to be bringing passengers with you who are not used to flying.  We want to take them up on nice, smooth days rather than having them jostled in the cabin against their seatbelts.