Yes. But in the meantime one can experiment with new things, void some assumptions. And I don't know about the LLVM project, but its quite more difficult to try

Yes. But in the meantime one can experiment with new things, void some assumptions. And I don't know about the LLVM project, but its quite more difficult to try different ideas in a big and old organization and codebase than it is in a greenfield project. Maybe they won't be successful, maybe they will move the whole field ahead.