The walkie thing is dumb. In a fully staffed store it is very easy to miss a guest who just happens to be crossing across an adjacent endcap or turning the corner of a trend run. In a store where there is one hard lines team member covering A, B, C, D, & E (or whatever breakdown the store uses), you are basically askin for guests to be mixed.
Also, a singular script being related by one position is much more easily controlled than the communications by exasperated employees who have no interest further than going home. Of course few people WANT to stay late after closing, but to be honest, some people are general jerks about the matter and simply don't care. Last week I walked into a (non-Target) store 23 minutes before closing to get one single item. My trip should have been no more than four minutes including check out. On my way in the only visible person at all was a cashier roughly 40 feet from me who greeted me with "We're closing in about 20 minutes." I turned around and walked right back out. There are truly fewer things I find so completely off-putting.