Agreed, but
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There’s no real way of stopping people from replying early if they are hell bent on doing it. At least the editor does not prevent them from reading as they reply, here. Or even navigating to a completely different topic altogether while editing. It all works.
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If they are gonna reply early, they’ll jam “reply” on the first post they see that sets them off anyhow … which is effectively the same thing. You know, people are Frequently Wrong On The Internet.
Longer term I think things like showing, for new users, how many posts they read in the topic next to their username – will have a more significant deterrent effect than hiding the reply button from them.
(and we weren’t really even doing that, because every post has a reply button, yes?)