And this is why people reinvent the wheel. If you disagree with the core teams decision here, you are at an impasse. So, you fork and move on. Or, you think about it, and decide to create your own framework that will be like Rails, but do things the way you want to do them, including making xhr? work the way you think it should.

Reinventing the wheel gets a bad wrap. People suggest you should contribute to existing projects. The problem is when that existing project's direction diverges from your needs. Reinventing the wheel is part of the power of open source.

On a side note, considering the sheer number of types of wheels, "reinventing the wheel" comes across as a bit odd.