Z-fire LOS is not much different than regular LOS when it comes to clear flat terrain
This is LOS around as building with the 2018 EXE
This is LOS with the 2019 EXE
and YES as I said Z-fire has been tightened up. in the past you could Z-fire into areas you clearly should not have been able to Z fire into-----like 1 hex on the other side of a house that blocked LOS the game use to allow Z fire into..... now it does not and we consider that an advancement for the game not a step back or a bug.
Up to this release the game allowed Z-Fire from the unit with the red hex into the hex with the yellow X
Now you cannot fire over a house and hit the hex on the other side with Z-fire. That makes the game better not worse and if that changes gameplay for some players that's what it's going to do