The post in question was a tutorial for some obscure debugging feature for the parent program that the developers had never said a word about. I didn’t exactly know anything about it (which is why I bookmarked the post), so the only thing I could have added was “Thanks!” which is just spam since we’re able to like posts. Even if I could find something technically appropriate to say, I may not always be able to find something that’s truly valuable as a post and is essentially spam.
It might be worthwhile if I sent a PM to myself which I could bookmark, but it’s impossible to send yourself PMs. Even if it were possible, that’s still out-of-the-way so I’d probably still be inclined to bookmark it.