Since the cover is more of a myth in 8th edition, and shooting is (IMHO of course) way too strong in 8th edition the group I play in have been testing out some rules to tone shooting down a bit. So the game isn't decided on who gets the first turn as much.
A quick note first, your miles may vary of course due to what kind of terrain you use. We use mainly 40k ruins and there are holes everywhere so there are very few places to hide vehicles from line of sight.
Cover, infantry completely within an area terrain or behind the cover (within 1"), and vehicles have to be at least 50% covered.
The enemy gets -1 to hit due to concealment, and the models in the area terrain or behind the cover (within 1") get +1 Armour save.
And you get this for everything... Even whole buildings, not just ruins as in the rulebook
What do you think?