then you either set a unit that you plan on getting traits on time and risk it, or u keep old defense that worked before
either way you will know that everyone else will also be locked so it wont be unfair
the counterintuitive part i think depends on the person as to me keeping it editable is counterintuitive and opens cheating possibilities as well as limits possibilities for devs to give a “carrot” that would motivate players to set a "variety in the gw defense
example:
if thefense was locked then devs could reward setting certain defense types, as long as its editable they cant reward it as there is no clear way to when to give the reward or when to check if the requirements for the reward are given
The only thing im concerned about locking defense teams is small window to set it (only 1 day?) and the fact it auto-resets into your pvp defense (which could be as well bad idea)
but i think those arent unsolvable issues