If every tool supports a different subset of the language, all of them become less usable. An editor that can refactor bad code is more useful than one that onl

If every tool supports a different subset of the language, all of them become less usable. An editor that can refactor bad code is more useful than one that only works on code you write from scratch within it. This is part of why a good IDE is so hard; it has to cope with the code temporarily being in an invalid state because how else can you finish it?