I was wondering if there is to be any planned effect from the presence of atmosphere on a planet? From the simple, like faster unit speeds on barren moons because of the lack of friction to the grandiose, like the ignition of the atmosphere from planet impacts.
That is a good idea. For example, tanks should be faster on metal planets as on planets with vegetation.
Don't think they care too much about atmosphere effects. We currently have airplanes flying around on completely barren planets after all.
Atmosphere would only really affect airplanes that much. And even then the effect wouldn't be terribly great as all airplanes are VTOLs that can operate in zero-atmosphere environments. I mean, if the atmosphere was thick enough to be a liquid or non-Newtonian fluid, I guess you might see some interesting things start to happen.
I won't bring up the discussion here as well since we had an other thread with several pages about it, but basically: yes it would affect airplanes much.