CinemaSins got their start making videos about continuity errors and such in movies, and degraded over the years to where it's a bare minimum effort unscripted first-pass nitpick of a movie, such as "has opening credits", "kid's bedroom has toys in it", "they haven't introduced this character yet" when that character is being introduced. It's one of the most lazy productions I've ever seen.

ah, I've never watched a CinemaSins video. it sounds like something I can safely avoid

It is not just something that can be safely avoided, it is something that you should avoid if you value having braincells. That said, you would definitely be missing out if you didn't sample some of Shaun's (leftist skull boy) videos exhibiting just how bad CinemaSins really is.

https://www.youtube.com/playlist?list=PLB8NXe_on1cV3bJvw_FA1FX-FI7PGZnV_ Same playlist and videos, but invidious frontend: https://invidious.fdn.fr/playlist?list=PLB8NXe_on1cV3bJvw_FA1FX-FI7PGZnV_

For those who don't already know Shaun, I'd also recommend his more serious work on topics like the US dropping of nuclear weapons on civilians in Japan, The racist and ableist origins and continued racist/ableist use of The Bell Curve, his series on BBC's Transphobia, etc.