"why wouldn't they just have scales at the gates or somewhere alone the taxi route that weighs the entire loaded plane." Have you never flown on a passenger fl

"why wouldn't they just have scales at the gates or somewhere alone the taxi route that weighs the entire loaded plane." Have you never flown on a passenger flight, or are you somehow unable to imagine how catastrophically inefficient it would be to have a flight delayed/canceled when an airplane has been boarded and is taxiing down the runway? And if fat-shaming is a concern, how do you think forcing passengers to line up and have their weight recorded? Having an accurate-enough algorithm for estimating weight is obviously a desirable and achievable solution to satisfy safety and engineering requirements.