Stefan wrote:
The national airspace system is full of those bugs.
The airspace classes are by no means an US national system.

No, other nations ALSO have bugs in their systems, but since I haven't
flown in those other nations I'm not too interested on commenting on
them.

This disconnect between authority and
responsibility in Class D is also a bug.

It's no bug at all. It allows a controller to basically say: "stay in

that region" or "fly that altitude band" or even more important "stay

away from that region", but I won't be able to provide separation.

Yes - it allows the controller to limit your ability to separate
yourself without accepting any responsibility for the resulting loss of
separation. That's a bug.

If you're talking about bugs, then I'd say that the biggest bug is a
system which allows people to become pilots without knowing the
basics
of airspace classification.

I don't agree. First, no system is ever perfect, and someone will
always slip through the net who doesn't understand something. Any
systems that relies on everyone knowing all aspects, including those
that are counterintuitive, is very poorly designed. Second, I haven't
actually met any pilots who made it through without knowing the basics
of airspace classification, although I don't doubt that it's possible.
It's only when things are made counterintuitive that problems come up.
And third, I think lack of understanding of systematic errors (as
opposed to procedural ones) is a much greater handicap to safety.
However, we don't teach pilots anything about system design - probably
because if we did, they would start to realize what a poorly designed
and quirky mess the national airspace system is.

Michael