Also, rated lifetime does not take into account things like tugging the cable to the side of your PC because your foot got tangled in it.
USB C is extremely fragile due to its size and not much can be done to help it.
USB C might be created to withstand more insertion cycles. After all it is meant to be used for devices like phones that are plugged in and out constantly. Part of this improvement is just more experience creating connectors (yes, connectors got much better in the past decades).
A cable connected to a back of PC is not being constantly plugged in and out. Nobody I know is plugging in their keyboard or mouse multiple times a day.
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When I design my boards, I put connectors that match the size of the board. I don't put extremely tiny connectors on a very large and massive project. I want a connector that isn't too fragile for the project and this means matching it with the forces that you can expect.
We, humans, use different forces when around large objects than when we are around small objects.
Large PC standing on your desk means forces used around it will be potentially larger than forces around a small appliance like a phone. If you tug on a cable that is hooked up to the phone, only small force is needed to move the phone. And we are usually more careful around a small appliance like phone. If you tug on a cable that is hooked up to a PC, much larger force will be needed before you move the PC. And people are less careful and using larger forces when doing things around a PC -- a larger object than a phone.