DISCLAIMER - I haven't played in 2 days, so maybe I don't have any idea of how this screen currently looks.
Actually for that lower-left stat block I'm thinking of just having it always list every thing. Taking for example an empty non-epic Siege exo:
That looks great. That's exactly the sort of thing that would help me figure out my exo's overall ability. I assume that the different categories, if you had a global upgrade, would display something like this?
Propulsion-Related: (+28%)
Stealth Actions: 8
Trap Avoidance Level: 3
Self Destruction Level: 4
Though seeing that number there (28%) might be a tiny bit confusing for some people, to not know if the 28% is already applied to the numbers they see below, or if those numbers are pre-bonus. I just want to be able to see my global system bonus stats somewhere in addition to the raw stats.
Also, I know that was just an example, but don't forget 'regen window' under the Shield-Related category! And speaking of, if + global bonus to shield systems effects raw shield values, then regen, regen window, damage reduction, and raw shields should all be grouped together I think.
EDIT: I don't think having the weapon info in the bottom left is entirely necessary. The weapon stats could appear when you are hovering over in the tooltip just fine, but ALSO I would like if they were displayed when changing ANY module for the given weapon system (is that what is called the part picker?).
So, for example, a weapon with 0 parts added would still display all the weapon-based stats in the little part picker screen for that weapon. 8 range, 2 AoE, 52 ammo, etc.