Hi Dick
The recent accident between an F16 and a Cessna 150 in the U.S highlights why the class E concept is flawed, and at the very basic level,
unsafe. It appears that the F16 was operating with a clearance in class E, and the C150 VFR in class E (from my understanding anyway).
Pages 2 and 3 of this discussion make for very interesting reading, particularly about U.S airspace concepts, and it's shortcomings, by those who fly in, and control it.
http://www.pprune.org/rumours-news/5...olina-usa.html
I sit at the console every day and shake my head at some of the things I see in class E, and I hear the frustration in RPT pilots voices when I advise them of unidentifed VFR aircraft in close proximity, intentions unknown...
You should either be controlled in controlled airspace, or recieving a traffic service In uncontrolled airspace. But not both.