It seems kinda weird that Dotty is referred as "Scala compiler" when the language Dotty compliles sounds fundamentally different from Scala. Bit like saying that DMD (the original dlang compiler) is an experimental compiler for C++?

> Dotty, a platform aimed to develop new technology for Scala tooling as well as try out new concepts for future Scala versions, has reached bootstrap status. This means that its compiler is written in Dotty and can compile itself, thus providing a drop-in replacement for the original one

I would imagine that self-hosting is fairly minor aspect of being a drop-in replacement of exising software compared to backwards compatibility.