It's far from black and white when it comes to feedback, once you're at the point where an investor is spending real time with you they're much more likely to give you feedback if they think you're able to react to that feedback effectively.

For example if they think you need to prove out certain assumptions then they'll tell you those assumptions, because it's in their interest. If they think you personally as a founder are uninvestable then they're unlikely to tell you that because there's no advantage in that for anyone.