I know Aaron isn't saying that the investors don't matter.
But when I think about why VCs hate going through an auction-like process, at least part of it is human nature. Like, we're about to work together for a long time. Let's not start off by commoditizing what we each bring to the table. I understand the POV that 99.999% of what VCs bring to the table is the literal commodity of cash... but if you have good ones, they really can help.
In our case, we had multiple term sheets for our Series A so I was able to optimize terms and get the partner/fund who I thought would add the most value but at "market" on the other terms. "Market" being what was on the other term sheets. That seemed to work OK as a softer way of actually doing the auction.
The real point in all of this is that if the VC's value-add is true, then you shouldn't NEED to discount things because of that. If it's real, then they should be happy to pay 'market rate' to invest in you, and the impact of their other value will be that together you build a better business, which is more valuable to them too.