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.
I really don’t get why people get so upset about that. We don’t get summaries on Youtube either but still watch the videos.
We go to youtube to watch videos. We go to lemmy comments to read text.
Youtube videos DO have descriptions, though?
There’s just something off-putting about a text based forum getting video content.