I have come across this a few times and it isn't too big of a deal.
Generally, I am subscribed to get emails when new threads are created. The text of this post is obviously sent in the email body. Occasionally, I go through and start a formulating a reply based on the email, then go to the forum to submit my reply. When I get to the post, the text is almost completely different. The OP had modified their post and there is no indication of this. Even just an asterisk next to the time-stamp, or an "Edited on Feb 15, 2017 9:32 AM" would be good to see.
It really is just a minor inconvenience because you end up second guessing that you clicked on the right post in the first place.