Like I said before, it isn't just Disney. Let's put the blame where the blame is due, Don Sonyone. Disney is apparently allergic to giving any of it's standard DVD's any special features of any kind, and it's treatment of the Muppet movie is no different from their bare bones rerelease of The Lion King.
Welcome to the Muppet Central Forum!
Sesame Street debuts on Netflix
Jim Henson Idea Man
Back to the Rock Season 2
Bear arrives on Disney+
Sam and Friends Book
Get it? Rowlf! Ahhh, I'm so fun-nee! Wocka Wocka! 

LOL!