Most of the time though the issue is we don't trust links in comments/posts on websites we otherwise trust. Those websites don't allow people to inject javascript code in their comments (but they often do allow people to change the link text).

Of course, once you're willing to run arbitrary javascript code you can't trust any mouse click anymore. Doesn't matter if the click is on a link or a button or anywhere else. Disallowing href attribute modification doesn't help one bit.

So the "hover" hint you get for links is still highly useful, especially on sites you trust.