Following the issues highlighted in https://docs.google.com/document/d/1eB6cGCG_2ircfS5GzpDC9dBgikeYYcMxghVH5sDESHw/edit?usp=sharing and discussions held with the TypeScript team. Together with the TypeScript team it was decided that the best course of action is to rollback this feature. In future, it is not excluded that solution style tsconfigs are re-introduced. See: https://github.com/angular/angular-cli/pull/18478 PR Close #38394