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...but my point was/is that if you do not also have baggage to check, and can therefore go directly to the boarding area (assuming that you've checked in online and have provided your passport info online, if needed), then (with the exception of some low-cost airlines, which includes Lufthansa these days) it's very rare that the airline will have scales at the gate and weigh your carry-ons.
We fly KLM and Air France all the time, including last month. Unless we have luggage to check (which we rarely do), they have never weighed our carry-ons.
How full were your flights? I don't think there was a single empty seat on ours. I saw a hand held scale being used to weigh a carry on allotment for one person at boarding, though it wasn't common. Given the weight restrictions on the carry ons, we needed a checked bag between the two of us. That was only half of what we were allowed for checked bags, so we did a decent job of packing, with everything getting used, and laundry done along the way.
IP