Not mixing anything up, jmm - don't quite see your point as I was not referring to any specific location. I would suggest that your approach of "we can control VFR flights just as much (in Class D...)" is precisely my point - that that classification should not be a mandate for arbitrary level restriction just for ATC convenience beyond, perhaps, initially after departure if there is a holding pattern overhead the aerodrome.
2 s
The classification is EXACTLY mandating that... otherwise you'd have class E instead
I do understand your point though, my point is: Control is control, it's not like it comes in various degrees... the same goes with seperation, either you will be seperated, or you won't. We're still here to "prevent collision between aircraft" and "expedite and maintain an orderly flow of traffic". I do agree, there's no need to restrict VFR flights if not needed.
Glad I spent most of my career in Class A where I knew who was running the show!
Lucky you
(By the way, I know who's running it in D as well, I do!)