The problem with adding actors who are replacements to the regular acting categories is that often a great role in a long-running production could end up monopolizing a particular category. For example, it's hard for me to think that Estelle Parsons wouldn't have won a Tony for replacing Deanna Dunagan's Tony-winning performance in AUGUST: OSAGE COUNTY or, in this case, for Marin Mazzie not to win a Tony for replacing Kelli O'Hara's Tony-winning performance in THE KING & I.
I will say, there's a committee in place whose job is to sort this type of issues and find a solution. The solution is not to deny these great performances of the chance of receiving a Tony award for Tony-worthy performances. The Tonys simply cannot operate the way TV or film awards do. They need to figure out a way to adapt to the nature of theatre, which largely has to do with replacements. There are so many great replacement performances each year, they should absolutely be recognized.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"