I suppose a big part of why it's not on the list is that the overwhelming number of shows that have just basic hair and make up would make it hard to consistently find nominees - how many times can make up for the basic 60s, for example, be awarded. But yes, it is certainly designed by an artist, then taught to the actors. (unlike TV & Film, where it is always applied by professionals - but not usually those that design it, either)
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.