Here's an example:
Take someone like Sage Canaday, who's been trying to get in the trials this past few years and missing by seconds, a minute, more or less. Put him in Vaporflies, in similar fitness, and he's likely in.
Is it a better performance because he ran faster? No. It's the same as a tailwind or a downhill course. That's why we have rules to decide which race courses are record eligible and so on.
What's interesting about a shoe is that the advantage is there, everyday, in every course and every course condition. If you race in Vaporflies, the qualifying time for the trials has been loosened (de facto) for you.
So,if the shoes stay, we need to recalibrate what constitutes a good performance, and probably tighten qualifying times. Which in the end will just bite our asses, because getting in will be just as hard as it is today, but you'll need to pay 250$ for the shoea that get you there.
That's what people aren't talking about. These performane enhancing shoes (Nike and otherwise) make people significantly faster, devaluating fast performances. Take to trials: you now have a number of guys who, fitness wise, didn't have it until the new shoes arrived. They are, in fact, running doped through shoe tech. So either qualifying for the trials is less impressive now than it was a few years ago, or the qualifying time needs to be lowered to 2:1'5-16'.