[stitchy]

Sure, if you have the choice. But that's were the Hacker News startup culture and the enterprise development culture diverge. In a small startup you can dictate the tools. In an enterprise company you may not have any say in the matter. You can either complain endlessly about it (and boy howdy are people willing to complain endlessly) or you can do your job to the best of your ability with the tools available.

I understand where you're coming from though. I just think that you need to know a lot of context about the developer in question before you dismiss him/her over their tool choices. You need to know why they used those tools and how well they learned them.

But what it really comes down to is how fast the developer can learn something new. I'm fairly confident that I understand enough about programming language concepts to be up and running with a new language in a few days. I might not know the API (if one is provided) but I will probably be able to contribute to the team pretty quickly.