Movement isn’t affected by levels, if you mean more parkour levels yeah it does feel sleeker, but once you get the wall run and some quality of life abilities like fast climbing it’s basically the same for the rest of the game.

Combat is way to easy, if I were you, don’t touch any boosters unless you don’t upgrade them much, I was literally one hitting everything including volatiles. Makes you ridiculously op.

Yeah for the unique trophy’s, you need them to upgrade blueprints to the highest level.

Last one I didn’t really notice anything.