Earlier quoted context omitted.
Two things: 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.
how does a port “wear out”? i’ve never heard of that
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.