I hear the complaints that terrain doesn't matter in AoS and think "bull." Make it matter. Yes, it's hard to hide a mawcrusher, but my mounted heroes hide just fine on my tables, thank you.
To add on, the other shooting issue is the assumption that shooters can always see. It has crept into the mindset so thoroughly that I've played tournament games recently where the opponent shot over a hill to a unit down-slope he could not see. In a later game another player didn't bother to check individual models' line to a target behind a building and rolled for all his shooters.
It may be uncomfortable, but we have to have the courage to politely say "hang on, they don't have that target available" instead of letting the LoS be assumed to be all-clear, all the time.