Alphabet is known to mess around with the algorithms so you’ll always get disgusting Nazi shit in your suggestions sooner or later. Also, a lot of people can’t back out of doom-scrolling, because of bad impulse control (people with ADHD for example). And even if there’s something informative in there. It will always lack a lot of information. It’s like merely reading the headline of an article and then going into the comments, claiming you know everything about the topic (happens on Lemmy a lot).

It’s nice that you seem to have a grip on these shorts, but it’s even greater that you can use certain tools to eradicate them. On my mobile phone I use YouTube revanced and on Firefox/waterfox I use Tweaks for YouTube. With the latter you can also change the thumbnail size and grid the way you want so you don’t have to cope with the ridiculously large thumbnails.