Boy J, you sound like you are in the wrong line of work.
That's pretty much everything a line guy does. As a pilot and former lineman here is my view.
90% of the line guys who park me use the wrong signals themselves. Many of the pilots who get used to the wrong signals won't follow the "right" signals when they are actually used. For example, when we are taxiing perpendicular to the parking space coming into the ramp, most linemen will give the signal for "left turn" when they actually mean "continue straight." When a lineman actually uses the "continue straight" signal, some pilots will turn toward them. Personally, I'd rather a lineguy hold one wand up and the other pointing at the center line. I'll get it in the right spot.
PS...I have seen several planes run into fences and poles while following lineman's signals. You can see the reason for apprehension.
Some linemen try to stop you too quick. I am not going to plant my pax into the shoulder straps just because a lineman wants to hit the "T."
Many companies require triple chocking....NetJets is one of them. Winds can kick up and blast from other planes can spin it. (As well as errant tugs and ramp vehicles). I have seen planes from a C172 to B727 spin around in the wind. It is much simpler to put in the chocks than face the liability.