The beauty of the DXCC program is that they haven't legislated every conceivable situation when it comes to actually working the DX. They've left the fine print for determining what counts as an entity.
If you don't think you should be able to work DX from any station other than the one you built, that's fine. Don't.
If you think it doesn't matter what station you work the DX from as long as it complies with the rules, i.e., same entity, that's fine. Go for it.
If you want to limit yourself to working DXCC with only calls that end in "Z", that's fine. Good Luck!
It's your award. You make it what you want it to be.
Enjoy the chase! (Wherever you chase it from....)
I like this the best. Just makes too much sense to me.