Thanks for the feedback Luigi!
You have a valid point about privacy. That is why I figure it would need to be a feature added to the enterprise enrollment APIs that would allow the request to occur without the user knowing the email address of the Admin or vice versa. Or maybe if the Admin console allows notifications it could be done that way (i.e. no emails) so the admin sees it the next time they log into the management console. I haven't used the enterprise management console, so I might be suggesting something that doesn't exist.
I think it would make sense to require an end user to login to a gmail account prior to issuing the request so the user could be blacklisted for improperly using the feature to spam or pester an admin. The admin could deny the request and ignore future requests from the same user, device id or both for a certain time period to mitigate cases where a user thinks they can exhaust the Admin by just flooding requests.
Also, I appreciate that you touched on the e-waste aspect of the topic too because it happens to be one of the larger reasons why I think such a feature would be quite nice. I am finding plenty of used ChromeOS devices that are fantastic for a variety of use cases even outside of their AUE, so I consider it a shame when one can't be repurposed due to being enterprise locked. So far, I haven't encountered any that are still enrolled, but it hasn't stopped me from considering the "what if".
I am not a googler, so can't push the idea any further than maybe submitting it to a more proper location?