This decision turned me off from Deno in a big way. It's as if they actively refused to look out to the community to see if the problems were solvable before throwing in the towel. It's quite possible to have instant incremental updating of TS projects, when I was a developer on VSCode (a much larger TS/JS project than deno) a change to the source code would be reflected in my dev build in less than 100ms.