Ok, I'll dial back the snark and just be blunt. I think all your concerns about CoffeeScript are hypothetical exaggerations. I don't think you've written much CoffeeScript at all, and I suspect that if you did, you'd quickly see that your concerns are overblown. In theory, you could have thousands of lines in a single file, and two commits from a separate branch could cause an undetectable accidental naming collision. In practice, this rarely happens. Files tend to be smaller, merge changes do to tend to get scrutiny, and name collisions often have fairly obvious symptoms once you run your tests on the code.