It's very strange and there was in the past some garbled youtube language about why you can't. I read it and still didn't understand what it was trying to convey.

While you can't make playlists personally, "kid playlists" do show up when you search and my experiences have been disturbing whenever i try any.

The playlist starts with a video or two that you were probably searching for originally. You step away to unload the dishwasher or take care of the laundry while the little one continues to watch. Then all of a sudden an acid-trip, parody version of one of the previous videos kicks in with jarring effects, questionable and suggestive content and lyrics. But it never quite crosses a line that would get it kicked off of youtube. Viewed alone it might come off as funny to an adult or even teenager.

How and why were the users of these playlists able to add/mix kids content with this other garbage and yet I can't make a private playlist with personally curated content?

I will never allow my kid to watch youtube unless i'm picking personally previewed content.

Edit: just to be clear these "kids playlists" do not contain content uploaded by the same user that created the playlist.

Edit2: I am (we are) also premium users.

Yeah, I remember reading a lot about those playlists, and I understasnd that can be pretty disturbing or upsetting if you as a parent assume that a playlist is "safe".

However if YT already has the ability to mark videos as for kids-only, I have no idea why wouldn't they be able to restrict playlists that contain even a single video that is not kids-only.

I.e. if you want to have a YT Kids' playlist, then all videos need to be YT Kids.

But the other way around (i.e. a regular playlist with some YT Kids videos) seems irrational.

For those wondering here’s the full list of features they make unavailable: https://support.google.com/youtube/answer/9632097?hl=en

+annoyingly: “Playback in the Miniplayer”

YouTube is bastion for grooming and child exploitation through its unprincipled design and lax moderation, and in an attempt to remedy this without shaking parental faith in their child-profit machine, Google has allowed elective disabling of the two most common ways to influence targets and connect abusers to potential victims: the comments section, which does not allow seeing other comments by a user, and playlists, which can be made private and shared, coordinated, and extended on external mediums.

You didn't miss anything they didn't want you to miss. Massive companies like Google with social media products can afford lawyers, PR and marketing teams, and experts on human behaviors. The ad era brings in phenomenal wealth, but can we all bear the cost?

I can understand disabling the comments section, but for playlists I would've expected that you could only make playlists with all videos from the kids section, or if you add a kids video to a regular playlist, then that playlist can't be played in YT Kids.

But not being able to add a kids video to my own playlist, being an adult and such, seems... incoherent.

yes! this is also a great point. YOU CAN NOT MAKE A PLAYLIST OF KID SONGS FOR YOUR CHILD ON YOUTUBE. Do you see how weird this looks?