Tool Support Should Be Loosely Coupled

I just read the following in a month old post on the RSpec list:

As someone who uses an IDE, I find dealing with multiple SCMs is a real pain, and one of the cool things about Ruby has been that (traditionally) nearly everything’s in Subversion

It might be that Rails will have hard time keeping up with new stuff, both technically and culturally, since it tied really close knots with everything that was cool 2005.