Coming from another country with similar airspace usage vs coverage issues (Canada, for those wondering), it's been absolutely shocking to find out how silly the airspace is here.
It has been equally silly to see that there isn't such a thing as Mandatory Frequency airports, as there are in Canada
As an aside, NavCanada - Canadian equivalent of AirServices - puts those in at airports that are a) busy enough for a plain uncontrolled airport to be unsafe, but b) not busy enough for a tower. Staffed by an FIS (either on-site or remote), you have to have made contact prior to zone entry (typically 5 minutes prior), and have to declare intentions. The argument in Canada is often on whether that thresholds are set too high, but at least you have a minimum level of service.
Oh, and for the busier ones, they are typically inside class E airspace (but don't have to be).
Something like it seems like it would be a good in-between solution for busier airports that don't meet the bar for a tower, while also mandating some infrastructure is available for FIS/ATC to be able to at least get ADSB data down to ground level... And, from having spoken to a number of people here, seems like that was a thing here for a while, but then it wasn't?