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Airlines have all been looking for an excuse to weigh passengers like they do baggage for decades, as they can get a much more optimal trim, meaning the plane has better fuel economy, if they have that data and/or can load the heavier ones in specific areas of the plane.
You may have noticed on flight that isn't full, everyone is seated in a certain section, often in the middle nearer the centre of gravity, or near the back on a front-heavy plane, etc. Most airlines use a notional weight for men, women, and children (88/75/35 kg respectively, usually) and will trim with that average data, but obviously that's very rough estimates - with accurate passenger weight data, they could do this sort of optimisation on any flight, but even just knowing you have a 400 pounder in the front row could be a meaningful trim adjustment and potentially save a couple of tonnes of fuel over the course of a flight.
It's entirely possible this incident could be used as a roundabout excuse to start making you stand on the scales when you check in for a flight. It's for safety!