Another carryover from the old forum.
There were some more interesting approaches than "just hold a psi-blocker in your hands". (or tin foil hats)
So does that mean the humans will get indirect fire weapons after all?
If the aliens are allowed to attack without LOS, there is no other way to even get close to them when they are in a room or behind tall cover.
Well, not without leveling every structure on the map.
Oh, I'm not talking about a an off-map battery of 155mm artillery but if aliens are able to disable or even control the soldiers through walls and without LOS, soldiers should be able to do something on a similiar scale, such as short-range teleporting stun or frag grenades through walls.
Either that or play with a ground team of only vehicles. Smaller ones than "real" tanks so they can get to the aliens.
Basically like the Apocalypse androids that portugus mentions below.