Sure, if it’s just a bare link in the comments I understand, but as a post with the original video title and usually an autogenerated thumbnail, I don’t see a problem.
The YT descriptions are not shown in the list of videos and rarely contain a summary of the video.
Maybe I'm just old school, but I'm two spaces for life. I will die on this fucking hill. If you use tabs after just a couple indents all the code is off screen. I ain't trying to scroll in two dimensions all the time.