From my perspective I think we do need to ask social media companies to reduce algorithmic feeds that create echo chambers or as you say provide transparent metrics on this. Social media companies should potentially ban infinite scroll/short form video content, however this is going to be difficult to do if its based on age as it will fall back to the ID/age verification issues.
Feeds should also not show content considered R18+ unless manually hidden, this shouldn't be able to be removed. There is some horrifying content that can pop up on these platforms that young people shouldn't see unsolicited.