My selling point against dual independent locks is ALWAYS, "If you unlock one side, you need to walk under the vehicle to unlock the other. I wouldn't want to be walking under a car that was only safe on one side!"
Single point release was designed to prevent you from being in an unsafe situation.
In reality, I've never seen someone get hurt by dual independent locks (lots of other reasons), but for the few dollars difference in cost? Why take the risk?
The original question about locks clicking at one time is pretty commonly asked by mechanics to my service techs. When they are out of synch, it usually means one (or both) of the cables have stretched. It's not a bad thing and it's usually pretty simple to adjust them back into synch when needed. It IS a bad thing if they get so far out of synch that the vehicle is going up crooked or you cannot get them back in adjustment.
It's also not a situation where you want to make the adjustment with a vehicle on the lift!