Making a meal of it is a form of simulation surely? it’s cheating.
In association football, diving is an attempt by a player to gain an unfair advantage by falling to the ground and possibly feigning an injury, to give the impression that a foul has been committed. Dives are often used to exaggerate the amount of contact present in a challenge.
The bold bit is key imo. If a foul has occurred then they aren't gaining an unfair advantage, no matter how frustrating the histrionics are.
Imo if a player goes to ground under no contact and appeals, its a dive. They can't claim to be avoiding a tackle if they've appealled. Imo they've not go grounds to defend that action and should face retrospective punishment. Whether the pen is given or not.