Friend of mine is looking for a job, and related this exchange:

[Person1] A fund nearby got in contact with me yesterday. They're looking for someone to write a portfolio/risk management system and heard about the one I wrote. They were very excited.
[Person2] person1: In Smalltalk?
[Person1] Until I told him I did it in Smalltalk. "Don't you think it's odd to write a system in a language like that?"
[Person1] That was his response

I love group-think. Offer to solve a problem, and anything that veers from the expected path raises flags. Sure, there are times that's a valid concern. But if you find a person to help you build a business - and you found them because of their previous expertise in the field in question - wouldn't actually listening to them make some sense?