I have never seen a VC care about what software stack you use. I did have one particularly geeky one asking me for advice on whether he should invest in MariaDB

I have never seen a VC care about what software stack you use. I did have one particularly geeky one asking me for advice on whether he should invest in MariaDB. Your point about recruiting is spot-on, however. It's not that all candidates necessarily believe in the cargo cult, but they have their own career and employability to consider.