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Lately it seems that fewer comments are being shown before making you click to see them. For example, here's a picture of a recent question for which only the first two (of three) comments were being shown when I first looked at it.
No, it's part of the new "real time updates" to the page. When a new comment is created after you have loaded the page, it shows as "add/show X more comment(s)". The same is true for new answers.
"add/show X more comment(s)"