Yeah but if you always have to spend a lot of time finding something to watch, then that shows up in their analytics as increased engagement. Allowing you to remove garbage would make you spend less time in their app.
You can have the best engineers and bright minds, but if your product sucks or your ethics are non-existent, and you don't let those engineers act outside of the limitting borders of the product, then they will not be able to make the product shine. They might be able to make a more dystopian version of your product, within the guidelines and ethical framework.
And lets not forget, that ethics of the engineers also play a big role. A decent developer with good ethics might make something, that the best engineers would never have even considered making or releasing to the public.