So basically you say that if you load the suspension, then the suspension parts will be at the right place, which means that then, you can remove and add parts without changing the alignment.
It is a good theory, but how can you be sure that the alignment was already good? Or that the car was already stock? Just replace all the parts you need to replace and then do a proper alignment.
The alignment is a sensitive thing and so you need good tyres and proper pressures. But you drive down a bombarded lane and it is all over the place again. That is why it is a frequent maintenance job.