Since these "purist" keep making comments and raging about the most small changes some may want to the classic servers. They clearly don't realize they are not "purist" at all.
Unless you are playing the classic server on a Pentium III/IV computer and 1GB-2GB of DDR ram while running on Windows 2000/XP then you are not the purist you claim to be.
Edit: Also you will have little addon support and can only use addon's that worked back then.