"Purist" is a sort of derogatory term used mostly by people who agree with changes that others do not like (PLQ). I say that there are very few purists around here, since most of us accept the '07 updates. Purists mostly feel that they should leave the HM as they remember it from their childhood, rather than from when it opened in '69 or '71 (which is why most of us accept the discolored look of the plaques). 

I am not a purist. I love the updates that premiered in the "re-haunting" of  in '07, yet I think that some effects, such as Constance, need to be re-worked to feel less like a flat projection. 

Thats my 2 cents.