I don’t feel any of this conversation is on topic here – the issue was on a topic the user created he wanted to reply more than 3 times. That is easily addressable without a bunch of scope creep. If it is your topic, I think you have a reasonable Manifest Destiny claim that you should be able to dominate your own topic with a zillion replies.
We also absolutely do not want to make people wait a whole day to get out of the new user sandbox.
Also have you even tried it? You get a small post it note notification above the typing area when you start typing that we won’t be accepting the post after you type a few characters. I suggest trying it yourself on try.discourse.org to see how it works, #1 is not even true.