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.
> Incremental compile time when changing files in cli/js takes minutes. This is crushingly slow and painful to modify.
> The typescript organization/structure that we're using in cli/js is creating runtime performance problems.
Either way, my point is that there are very practical non-dogmatic reasons to use JS over TS.