For a non English speakers, they usually take some time to reply and most of the time they end up with `expired link`. I doubt the user who wrote very big comme

For a non English speakers, they usually take some time to reply and most of the time they end up with `expired link`. I doubt the user who wrote very big comment (usually highest rated comment in that thread) use HN editor, I guess they first write in the word processor and then copy it here since the amount of time it involved in writing comment is not sufficient. I use the HN edit box. On mobile, I take care to copy my comment to clipboard before submitting it, so that if I hit the unknown/expired issue then I can hit the back button, refresh, paste, and resubmit. On desktop it's a nonissue because when it happens you can hit the back button and (in firefox/chrome) the edit box will have dutifully saved your whole comment, so nothing will have been lost.