I've used the same USB c charging port in my phone for 2 years without any noticeable wear. I did, however, need to scrape out accumulated pocket lint with a safety pin on two occasions. Are you sure there isn't lint in the port you're basing your assertions on?
Former IT person here who deployed fleets of MacBooks with those damn dreaded USB-C ports. If you have "normal use" of the ports then you might not notice the low duty cycle but in an office where people are constantly plugging into their docks, dongles for AV equipment, Ethernet adapters for VoIP, and traveling it became a major headache. More wear than typical maybe, but certainly not abnormal.
On average, over the life of the device, every device needed to be sent to Apple to replace worn ports. Some unlucky sales people managed 2 or 3 trips to Apple. The annoying bit is that the turnaround time isn't exactly fast so we ended up provisioning the affected people new machines and then throwing the refurbs back in the rotation.
We never heard a peep from the Dells we also deployed that had a USB-C port for the dock, HDMI ports for the AV, and a dedicated port for charging. I like the idea of one port for all but they're just not strong enough.
Not the parent commenter, and I am not sure if there is lint in the port of my lightning powered devices, but I am confident that I have never had to clean it out to make it charge.
I had to clean out the lightning port on my iPhone 6 constantly, it was awful. With the XS I almost exclusively use wireless charging because of that experience.
Cannot comment regarding iPhone 6 specifically, as I had been using Android phones after iPhone 4 up until XS generation came out. It might be that Apple has upgraded the lightning port tech over all those years between iPhone 6 and XS, but that's just a guess.
