There are some memory effects, that need a specific signature move to be working.
There should be a character filter for the memory sets for the combat supply shop.
Another thing what bugs me is, if you are in early game like me, on some events, where you are forced to swap characters for the squad, you always have to move all your memory sets around to make the game somehow playable.
A suggestion would be, make the memories free to place where you want, just before the combat starts, you get a warning, that multiple characters using the same memories.
And since we cant keep track of all the memories we place, we should have memory set profiles we can choose from.
The warning should maybe also include the conflicting memory profiles.