but surely Mutt, the whole point is that it's optional!
You wouldn't be obligated to hide a poster, so how exactly would it affect you and your user experience?
As clearly stated, it is a widely used function elsewhere, and providing it is implemented in an intelligent way, I can't see the concern.
We don't all read all the posts anyway, there are definitely posters who write drivel that I mentally blank - given the choice I would grey them out such is their propensity to spout nonsense and dish out god awful advice.
Besides, there are a lot more people who read threads, will no-one think of the lurkers?
Surely, like the hide a thread option, it enhances the experience for those who choose to utilise it and everyone else can ignores it.
I'm sure that MNHQ have the ability to trial the function in a fast moving part of the site - say AIBU, and then see how it pans out from there.
So - lovely MNHQ, may we have a trial please?