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You don’t lose the message though, so it’s infinitely less annoying

Rule #1 when typing longer texts into webforms/textboxes: ALWAYS do a CTRL+C before you click submit.

That's because you're in the bad user doghouse.

At least on HN you can Go Back in your browser and restore the page before submission with your post in the box.

But it would be _much_ better if when you hit reply, it gave you a message that you're "posting too fast" before you spend the time to write it up.