Good egg:
I think the controllers do a little more than ensuring separation on the ground...
Of course , and I did not say that either, maybe I should have put a comma before " and" but what I wanted to say was that how difficult it is to fly the approach is not part of the controller tasks.
As to the number of Mvts , yes it is a problem because it affect the concept of multi airport simultaneously controlled by a single controller . Remember that is where the benefits will be . Switching to remote from an existing concrete TWR is far more expensive.
Last bit to show our employers way of thinking : last week in Madrid CANSO introduced the notion of cross borders remote TWR operations. Digest slowly that one for a minute...