I think funding and margins are the thing that are actually causal here: when you're swimming in funds, can afford to hire whoever you like to do whatever you like and you don't need to be turning a profit for at least 5 years, the organisation can be run very differently to one in which quarter to quarter cashflow really matters and there are margins to think about.

Funnily enough I work at a software company which is bootstrapped and where cashflow matters, I'd love to run things like a fully funded SV startup but I can't. We just can't afford it.