What the heck is vestigial about it? And why do you hate it so much? One can find pertinent things through hashtags here, and one can scarcely hope to find them any other way.
@mxchara@eris I totally get dropping hashtags on the end of a long significant post you want to attract discussion to or something, but why would some random irrelevant reply need to be that easily searched?
I can't answer that, but surely there's no way to implement a mechanism allowing a person to signify, "I would like my post to be more easily found on search," that isn't going to be used badly or nonsensically at times. I think it's an acceptable drawback, a minor nuisance. It just looks silly.
My apologies. I happen to like that there's some kind of mechanism like hashtagging, and I myself feel like it's in the spirit of the early Internet (which often featured highly hyperlinked hand-coded webpages) so I am keen to defend it.