Jets & Planes but no UAV's here.

[Imp]

If your looking at dialling back TI in some cases in a players hands a difference of just a couple of hexes is a huge advantage Cheiftain with 22 vision for example instead of 20.
Modern battles can be quite complex especially vs countries like Russia when you suddenly come across a platoon of tanks with vision that outranges yours.
The AI can take advantage of this if its defending.