yes. absolutely correct. there is no such thing as absolute control. But there is such a thing as a relative degree of control which allows one enough autonomy to control the status of that asset. Please see my car example above.
there are other forms of control that reduce your rights as an owner including the one you stated above. but in NZ's case, fundamental ownership of the home remains yours. All they have done is to restrict your ability to sell to an open market by controlling the supply. They have NOT changed your ownership status. They have restricted the demand and potential buyers that may access your home should you choose to re-sell it. You can try and sue NZ govt for impairing the value of your home, but it's still yours to live in long after you dead.
TBH, I am not the most famililar with CPF controls other than what I glean from here, but it appears that those restrictions remove the right to changing the status. i.e. withdrawing or depositing or whatever you can do to the CPF and therefore remove true, independent ownership from the holder of said monies and places ownership of it within the demesne of the ruling body governing the CPF. The fact that it yields a rate of return is not necessary to determine ownership. It can be a feature of ownership or a benefit of ownership. you can not own an asset and still generate a return or yield that is still yours to keep.
and what happens if your house doesn't generate income? does it then cease to be your house? does it become somebody else's?
while useful in itself and definitely a very important reason (some would say the only reason) to own an asset is the return and yield it generates. it does not mean anything when it comes to determining ownership. it is a benefit of ownership.