They are replaceable when the external ports (USB-C or otherwise) wear out without the need for soldering or internal board replacement.
The design of the modules is open source, meaning that anyone can design a module that fits their needs.
With USB-C, the connector was designed consideration of a bunch of factors, one of which I would assume is lifespan of the end connectors - USB-c has thicker, more resilient plastic hooks built into the inside of the male plug and stronger mating latches in the female end of the connector.
https://www.quora.com/How-do-USB-cables-particularly-USB-C-s...
If your laptop has a cheap connector which isn't rated for more, and you do two cycles a day (start/end of day, start/end lunch), then you'll go through the rated number of cycles in less than two years.
Doesn't mean the connector will fail right away but it might start to act up. Connectors are not forever.