Because Ron, I live the actual real world called 'planet earth'.
So you are saying that what FAR 1 calls 'pilot in command' is somehow unrelated to what you log in the PIC column of your logbook.
Sadly, you're correct. You certainly can fill any airplane, including an A380, completely full of 'pilots in command'. Or no pilots. Or any number in between.
It's true that the FARs are so badly written that they create this twisty turny maze of tiny twisty passages that lead to a regulatory world where airplanes can have zero to several hundred 'pilots' logging what they laughingly call 'PIC Time'.
If you want to live in regulatory crazy town, knock yourself out.
Meanwhile, back in the present quantum reality the 'acting/logging' business is, in reality, somewhere between silly and fraudulent when used for any purpose related to determining the actual type and quality of experience of an actual human pilot.
Log whatever you want, that logbook is your property. I'm just telling you that if you are not in charge of the darn airplane then don't try to claim that you were the PIC of an airplane.
Log it in a 'fake PIC' column, where it can make you feel better about yourself without misleading those of us who live in the actual real world, as opposed to FAR crazy town.
Strong message follows.