The only real disadvantage I can think of to a properly designed reply button is that it might lead to more replying, encouraging protracted conversations in comments.
The original arguments against a reply button were mostly that it would result in the @ notation used unnecessarily, in places where users wouldn't otherwise use it. But in addition to having ...
About Jeff Atwood's answer,
AXIOM: A bunch of comments filled with @username are harder to read and noisier than those which are not. The goal of our sites is to
increase signal-to-noise, not reduce it.
The average number of comments on a SO question is 2.5.
The median number of comments on a SO question is ZERO.
Post owners are always notified of ...
That particular comment is automatically generated by the system through the Low Quality Posts review queue. I'm not sure if there is a list of these (so you can copy them) but you can see all options here:
Nowadays, the comments have some links in them, but the text hasn't changed significantly over the years.
Other interesting links:
Repository of ...
Those comments are only generated in the Low Quality Posts review queue, and automatically (you can choose from a list of half a dozen standard comments, or choose to leave no comment at all). You get access to that queue at 2,000 reputation.
I agree that these comments can be useful from the First Posts (or Late Answers) queue as well; that's why I use the ...