@masukomi I think it is the official line that Pharo is its own language, initially forked from Squeak #Smalltalk. I don't know how much it has "outgrown" Squeak, couldn't install it.
Couldn't install #CuisSmalltalk either, to see how much Squeak flab it has shed. But it sounds like the one with which to build software for/by oneself. #DrGeo is being rebuilt with it.