First, why don't units have an upgrade option (e.g. click on a T1 radar and click an "upgrade" button)? I remember having to destroy mexes before building mohos in TA; upgrading in SupCom is _so_ much easier. Second (also comparing to supcom), why are the strategic (zoomed out) icons so hard to read? (It may also be that 3D models are getting replaced with icons too soon on my high-res monitor.)
The primary issue with the icons is that they overlap too much, I'm hoping they'll do stacking icons. Upgrading is in progress, however, it will work a little differently than SupCom. You will be able to build T2 Mexes on top of T1, or build a combination T1+T2 mex on empty points. You don't really need to upgrade radars, just build more.
I think they should make the icons work they do in ruse. They did a very good job at making the zoomed out UI work.
That doesn't work so well on sphere though because there would be huge pillars of units sticking out of the atmosphere blocking your sight...