Do we know why? Is there some hole the official one isn’t filling? Seems like having 10 different compiler implementations would be a portability nightmare. Now I can’t guarantee my typescript is going to run the same on node/angular/whatever

Yes, one hole is no longer being able to just integrate the Typescript compiler into other tools.

The team has posted reaching feature parity with broken workflows past 7.0 release.

https://blog.angular.dev/an-update-on-angulars-typescript-7-...

https://devblogs.microsoft.com/typescript/announcing-typescr...