Surely there must be some lower bound of technology after which a candidate can be completely excused for turning down a job regardless of the factors you have said should be their criteria. Examples: Perl, COBOL, or punch cards.
There is—at which point you need to find candidates primarily by their willingness to work with your tech stack, which means you probably have the wrong tech stack. It's not like leadership at punchcard-dependent firms disagree, and think their tech stack is great; they just can't switch that choice on a dime, and often need those punchcard experts specifically for the get-of-the-punchcards effort.
