People complain about "made for kids" videos not being allowed to have comments. But I don't see it as that big a deal.
I feel like YouTube comments are more for people who upload their own content. Feels like comments are good for letting us know what parts are popular with the public/viewers, for future improvement, for feedback, and so on. If a commercial work is uploaded by a fan as opposed to copyright holder, then it's just the fan being told "this was funny" or "that was horrible" or getting comments on things that should have been different, questions and comments about things that the uploader has no control over.
If it's an official upload from a studio, it seems like a grey area. The comments may be helpful for future installments, but the official uploads might be for an old work from many decades ago (like early Sesame Street), maybe even something no longer currently in production. And sometimes people who worked on a project might just upload things they did, even if they don't necessarily own the distribution rights. If it's a performer or musician or somebody uploading their work, then it could be like fan mail.
It is fun to comment on things that are also commercially available, regardless of whether our comments make a big difference in terms of future works, but it's not entirely necessary (and I have commented on a lot of official Sesame Street uploads that I wouldn't expect Sesame Workshop to provide answers or improvement for - and not just because it seems Sesame Workshop didn't reply to YouTube comments). But there are plenty of other places to talk about these kinds of things. There's forums, though I don't know if every fandom has a forum (I've never heard of any Peanuts forums). But even if it doesn't have a forum, many forums have general discussion threads (this very forum has one - we can have threads for practically anything on the Muppet Central forum!). There are social media pages, both official and fan made, especially group pages. Of course when talking about a specific clip or episode, it does seem better/more convenient to talk about something on the video link page as opposed to starting a thread about it.
But making and watching videos is more important than commenting. Though there have been times when I clicked on links more because I wanted to see the comments or see if people brought up certain things. Last week I actually watched a Sesame Street clip I don't think about often to see the comments and forgot that "for kids" videos don't have them.
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