I have found this annoying as well, but then the other day i kept running out of bandwidth and so my comment might go through, but the upvote didnt or vice versa. So i guess there are sometimes good reasons for it.
If its at least a good comment, then maybe the lack of upvote isnt so bad.
Ah yeah, I know what you mean about the bandwidth, it can sometimes have and effect. You are right, if there is thought in the comment it's different. But typically someone who goes to the effort to leave a well aticulated reply normally upvotes out of courtesy.
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