On the hard parking lot defense, i'm curious as to what prevents attackers from spawning in the street behind the car, suppressing defenders, then just popping smoke and getting the flag? Thank you. And great information for us newcomers. Greatly appreciate your hard work.
In most hard parking lot defenses, the only place where you can spawn is the top left car. The top right car is within the range of at least two towers and some ground defenders, so if you spawn there, some of your men will already be down before getting the defenders suppressed.
If you mean the bottom left car, you wouldn't want to spawn there because it is within the range of almost all defenders. If you manage to avoid getting killed, you will be under suppression, which also means your throwing range is reduced. And with the flag being on the right side in most hard parking lot defenses, smoke-stealing is no longer an option.
Also, you wouldn't want to spawn behind concrete barriers, because they offer less cover.
You can grenade the towers from the inside (when you spawn at the top left car), but you must get past the gatekeepers first. Of course, to be able to do so, you must find all the right angles (to bring down gatekeepers) and avoid the enemy line of fire (to avoid getting killed), not to mention dealing with other obstacles and being outranged by the gatekeepers themselves. The hard parking lot defense is probably the most challenging setup if done right.