> And again the question why not simply write something new.

The world isn't black or white. Some people write Rust programs with the intent to be drop-in compatible programs of some other program. (And, by the way, that "some other program" might itself be a rewrite of an even older program.)

Yet others, such as myself, write Rust programs that may be similar to older programs (or not at all), but definitely not drop-in compatible programs. For example, ripgrep, xsv, fd, bat, hyperfine and more.

I don't know why you insist on a word in which Rust programs are only drop-in compatible rewrites. Embrace the grey and nuanced complexity of the real world.