Young music students in the US are usually taught in a pre-conservatory style (analogous to how young students are taught in a pre-academic style). This leads to the mental prioritization of playing the correct notes, giving recitals once or twice per season, and following the movements of the ensemble leader. These are all terrible habits if you want a society where lots of people can play songs together and don't take music too seriously.
If you've ever been to a kid's recital and all the pieces sound awful, it's not because they can't play their instruments, it's because their teachers taught them the mental habit of stopping when they made a mistake, and then assigned them pieces at the upper limit of their competence. You must play through mistakes like they're not there, keep the rhythm with your foot and the melody line in your head. Also don't play the hardest stuff you just learned in recitals, play stuff you can do with your eyes closed while holding a conversation.
If you're a hobbyist musician, stop focusing on scales, theory, improvising, and correcting miniscule mistakes and start focusing on keeping perfect time and memorizing a whole shitload of songs. If you look up "Victor Wooten Music Lesson" on YouTube and basically watch every single thing he has to say you'll make more progress on your sound in one year than you did in the previous ten.
Music is meant to be played together, and to play together you need to keep time.