Put another way, the iOS interface, by rapidity of adoption alone, would seem to be far superior to traditional desktop-paradigm UIs. Would you agree that "common sense has to take precedence" and Windows and Mac users should have to abandon their systems and use iPads instead?
While there may still be (weak) arguments for preferring "select-to-copy" over "CTRL-C-to-copy" there is not a single argument for maintaining the mess of multiple inconsistent copy/paste methods in parallel.
This is not a matter of polish, preference or imitating what others do. It's a matter of finally applying the no-brainer lowest baseline of common sense.