Subject: More precisely:
Posted on: 2015-09-18 21:36:12 UTC
Look at the thread we're in now. The 'Edited' tag on your post makes it look as though 'Does this appear as New too?' has three replies: 'It shouldn't', 'Ooh, does it really', and 'Well, I'm watching.'
Which obviously isn't the case. Now imagine the thread was a controversial discussion, and the shifted title was 'I totally agree!'.