In part it is so no luggage is too heavy to handle. There is people who move the luggage by hand in several places. The individual weight of luggage is important for this reason.
Get a small portable luggage scale and use it to weigh your bags. Put it then in your bag so you have it with you for the return trip. The are cheap, light and easy to use. The one I have uses a surprising amount of battery so I have an extra button cell battery to it taped to it so I have a replacement,
I have been on full flights that left luggage behind before, but I’m not sure whether it was for space or weight issues. In any case, the reason for those weight limits is because they need to protect the ground equipment, and probably for health and safety/insurance reasons to do with injuries by staff, not because they’re worried about the weight onboard.
(Although they will obviously monitor that too, for flight-related reasons.)
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