Class D does not have to be restrictive to VFR flights, yes VFR flights need a clearance but it doesnt mean they arent gooing to get what they request.
It is still VFR responsibility to separate from other traffic, but with directed TI.
If there is so few overflying, as a few people have said, then why have E with gravy, when D would achieve the same thing and meet with the holiest of Dicks grails - ICAO.
I remember on another thread, Dick, you bemoaning the fact and declaring several other countries as completely incompetent because of adjusting ICAO class of airspace rules to fit their needs and traffic...Hows this here any different?!?