So you agree with me, a dipole needs no separate counterpoise. Thank you.
That was never in dispute.
How do you feel about a monopole? Those seem to work fine in free space, too.
My feelings are irrelevant. As I said, you need two connections. If you can't see the second connection then you just have to look harder until you find it. Unless, of course, you live in a part of the universe where physics is different so antennas no longer have to follow Maxwell's equations.
And... "grounding the shield cannot be done without a feedline choke..." Do you really mean "a feedline choke with a grounded shield works better for shield isolation than just a grounded shield" because grounded shields are used without an RF choke all the time and work just fine. sooo....?
I mean a coax feeding a dipole needs a choke if it is to be grounded. If you ground one side of a dipole feed without a balun then you have converted the dipole into a monopole.
Regarding placing an antenna perpendicular to a ground plane - any ground plane - man made or actual ground - produces an electrical mirror image of a resonant antenna and improves performance. In fact, a monopole placed over a perfect ground acts as a dipole.
No, a grounded monopole does not act as a dipole - although many of the simpler antenna books may say that it does. A monopole has half the input impedance of the corresponding dipole. In addition to providing the second connection so somewhere for the current to go, ground also provides a mirror which modified the radiation pattern. Ground still does this mirror role for a dipole, or an elevated monopole with radials, or a loop. Don't confuse the two quite different roles of ground: second connection, mirror.
You are wrong about non-resonant antennas with a fixed tuning network, like the CHA-250B benefiting from radials or being placed on the ground. I've experimented a great deal with this antenna, and it prefers to be isolated from ground as much as possible for the reasons I've stated above. And the manufacturer agrees.
I am not familiar with any commercial antennas. I tend to ignore statements by antenna manufacturers; some of them are misleading, some of them don't understand antennas themselves, maybe some of them hope their customers don't understand antennas. Raising an antenna will modify its vertical radiation pattern. Raising an antenna may reduce ground losses. Raising a monopole antenna used with no radials will invite feeder radiation; the return current must go somewhere and if necessary it may even have to pass through a choke balun.
BTW - regarding circulating currents, you are forgetting the radiated energy in an EM field, much of which never returns to local ground, and most of which does not, in free space.
Not at all. At the antenna feedpoint there has to be a current loop, even if part of this loop consists of displacement current. There has to be two connections, as you need two connections to impose a voltage; there is no such thing as 'a voltage'! Radiation satisfies Maxwell's equations. All I insist on is that antenna's do too.