This question is actually more linked to astronomy and astrophysics than to pure physics. I tried posting it on the astronomy page, however it got no answers, so I though this page might help.
Reading about the formation of planetary disks, one of the major problems, it seems like, is the evacuation of angular momentum. Aparently planets can't form with the amount o angular momentum the system has in its early stages. I think I understand where that excess comes from, the collapse of the nebula onto itself and provoking a spin. Then there are many hypothesis on how it's evacuated, which are mostly pretty logical.
Now my question, as a beginner in the study of physics, is this: Why does the angular momentum even need to be evacuated? If the angular momentum is too big, why can't planets still form? Does this have something to do with too much kinetic energy in the system? Thank you!
edit: my main source is this video: youtube.com/watch?v=tEgw0PXwkGE Otherwise the information comes from books, notably L'exporation des planètes by Therese Encrenaz and James Lequeux
link to the astronomy page: https://astronomy.stackexchange.com/questions/10073/angular-momentum-in-planetary-disk-formation