Concerning hijab and womens clothing (and mens clothing too). Why didn't the prophet just sit down and explicitly say what is mandatory and whats prohibited and whats your choice?

Why leave muslims until the end of time confused and arguing and fighting over whether to cover hair or not or whether to expose ankles all the time or just during prayer or not at all.

Womens clothing suffers the most from this. Cant even agree whether hair needs to be covered or not. Or the face. Or the eyes.

There are so many rules and laws of islam. I just cant wrap my head around why the prophet didn't sit down one day and give a clear lecture and tell people to write it down.

Why leave vague verses and hadith that just cause confusions. Hes the prophet, hes not an ordinary man who couldn't foresee that the lack of definite rules will cause problems no?

Why did the people of his time get the privilege of asking him anything but we're stuck with sayings and writings that we cant even agree on if they're authentic or what they actually mean.