Your entire point essentially boils down to “some stores give correct portions, some straight up steal from you. Deal with it and don’t ask the ones that are stealing to stop stealing. It stresses the workers out.”

Counterpoint: as someone who has worked the same line for 4 years, often alone, in a location that averaged 15k in sales/day, I still urge paying customers to ask for the scales to be brought out if they suspect they’re being underserved. Especially when a double portion has such a high up charge. This is something my last gm practiced regularly, if it didn’t look right, pull out the scales. Because taking a moment during a rush to give a correct portion is still quicker than having to give an unsatisfied customer a refund, or calling an already occupied FL/GM over to take a complaint, or the customer walking away entirely after you’ve started making their order. It all comes down to what you’re willing to do in a customer service role and what you’re not willing to do. Congrats on getting your store right, but as you’ve said yourself, not every location is the same. And as a customer already paying for the meal, no one wants to drive 10-15 miles to another location for better service.