no, but for seller reputation sake, WHO gets the sales matters a LOT. A limited brand that everyones knows 90% of stock is going to a reseller marking it up is going to quickly be done.

To the degree I'm describing it would

Imagine going to buy a pair of sneakers and the site asks for a scan of your federal ID. Do you even know if you have one? Where is it? Do you trust the site? It could take days to verify... maybe the scan was blurry and needs to be redone...

No retailer would add something like this to their checkout flow, it's a very extreme solution

Not extreme at all. You seem very out of touch with the reality of the enthusiast markets for such things. People line up for days for stuff like this. If all you had to do was provide ID online and wait 3 days at home... no problem at all.

I'm not out of touch with anything. I have a closet full of every almost every Yeezy 350 colorway ever released.

Just because some people will do something doesn't mean everyone will. Many people would protest having to provide government ID to buy sneakers.

Even if it scares off 1 person why does a retailer want to do that, pay the money it costs. and deal with the optics of being the ones asking for federal ID to buy shoes when they can literally just not instead.

Like I said above, demand is so far above supply it doesn't matter if 100% of sales go to scalpers anymore, they'll still sell out, and the aftermarket will still eat it up, no matter how bad they feel about not being able to get drops directly.