The problem is, these companies are being run by people who can't tell the difference between X and X/10, let alone X and X+1.
But they think they can because they got VC money and they are high on their own fumes.
Fire fast if someone is clearly not a right fit, but "Fast" should be after giving them plenty of warning.
Personally I'd prefer a place where I could do X and X+1 so it'd be a bit of a negative in choosing where to go, but I can live with it. OTOH I'd be extremely pissed if I walked in one day and was told "we think you're awesome, but you don't konw X+1 so see ya later"