I think the fact that you can continually have a viable program while doing the sort of refactoring they are doing makes it a lot more easy for lots of people t

I think the fact that you can continually have a viable program while doing the sort of refactoring they are doing makes it a lot more easy for lots of people to work on the project. Starting from scratch would mean a large portion of time where only people with a very clear design vision could write components.