[xook]

Genuine question: How many are written in Rust?

Maybe it's more "See, Rust can, too!" type software?

Footnote: I have not done extensive research, hence the question.

[bambax]

I don't know. Probably none. But I'm quite confident no musician or other user of a DAW cares what language it's written in.

If the goal is to demonstrate that Rust can be used to write that kind of software, then hey why not; but they will need to have users at some point, to be able to actually call it a DAW.