Actually if you play from mobile you see what you get from each upgrade ( how more scientists you will be able to add, how better stats your wall will have, even how many more workers you can put to work after resource production upgrade). Really weird this isnt viewable on PC. Definitely like this idea.
So how does unit accuracy work? If I have troop with 100 damage and 80 % accuracy I understand that 80 damage will go to 1 target and rest 20 will spread to other. But can you know to how many units will it spread and does it spread evenly across enemy units?