Why is that an issue?
New customers can wait until availability is less constrained. A lot of veteran customers will have to wait too, so... Shrug.
Alternatively, they can buy or build a similar HW small-PC and use SteamOS.
I see no issue.
The fact that a reservation queue is needed in the first place?
It's a perception issue. People tend to overhype anything that Valve does as a whole.
Nobody would be bothered much if this was some small Chinese Kickstarter project doing it but Valve is acting like this when they're a multi billion $ company with decades of experience.
Besides, do measures ever work? Every year, scalpers still somehow manage to bypass the system and resell en masse.