What I would appreciate is being able to view your whole squad on the Tactics screen, not just first 11 and Subs. This is because when you get to a match day it takes you to the Tactics screen, and unless you remember to go to the Squad screen beforehand, you can't easily get a view of your whole squad to determine who to put in the matchday squad.
For example, if someone has been injured and I want to see if they are ready yet to be included. I know you can choose a player and select to swap them out, but I prefer to look at the whole squad to decide what subs to pick. Not sure if I'm the only one who does it this way!