OK, I've listened to both sides. I can understand the need at BBC for support for most of their legacy users up to a point (schools with old computers and stuff

OK, I've listened to both sides. I can understand the need at BBC for support for most of their legacy users up to a point (schools with old computers and stuff like that). What I fail to understand is why start a framework from scratch? Couldn't you guys at BBC contribute legacy support to some of the frameworks (be it jquery or some other) or fork it and do what you need? Isn't that a more rational use of resources?