This is an unpopular opinion, but I think Hacker News would be a worse experience with link previews.

One of the best things about this site, ui-wise, is that it feels "focused". The focus is not on the links posted but on the text surrounding them, if you want to give a preview for what your link is talking about, you just explain it.

It also encourages less lazy discussion, because the title and pictures don't jump through the link into the current context.

It might not be a bad thing for X in the same way it works well here.