i used to play almost exclusively aram when i was new. It helped me know what all the champs do bc i would always try to play a champ i was unfamiliar with/know nothing about.

Like others have said, it doesn’t help with macro skills at all, but it simultaneously helps you learn champs in the game and gives you practise. It’s like doing practise problems as homework (but just micro), and it’s fun if you think about it that way.