Meh, as long as they appear it is fine with me, Kanto or non Kanto. They could have said that the dojo was in Galar and nothing would have changed. Also finally we got to see the Fighting Dojo, something we missed in OS. Also I think it is cool to see Kanto with modern day graphics.
The only thing from Kanto I want to see again besides Misty and Brock is Sabrina.