there i have to disagree
It's interessting / sometimes necessary to know what the user did...
if i would see that the thread changed (title or something else, => i know it's not possible with xf, but with an add-on) i would check the mod log...
If i wouldn't find anything, i would think that i've been hacked and would spend unnecessary time with checking access log to see what happened here
(but maybe i'm the only one who thinks so
)