I am just an NPC judge but if it is ok I can answer your question .Maybe Chick will chime in later?
EVERY experienced bodybuilder is a master of what you mentioned.
Arnold always did it and Zane may have been the best ever at "cheating" on a mandatory shot.
When asked for a side chest , Zane knew he wasn't thick from the side. So, he always tried his best to turn it into a side tri/delt kind of shot.
They know we are NOT just judging them in the actual pose, but while they hit the shot as well.
It can be annoying if they don't ever hit the mandatory pose or refuse to hold it, etc.
The best guys all know their weakness and strength. They only want to show their best stuff and try to minimize their weakness.
That is part of the reason why a good head judge will compare them in the same poses more than once.
Doing back shots, the rule is always to try and hit the pose a couple sec after everyone else did.
This way, you get the most visual impact from flexing compared to the others in the line up.