I have a Thinkpad that has both the USB C and the traditional Thinkpad charging port.

I normally just use the USB C port, but I do like having both available.

Even if the connector in my laptop broke, there’s second one that I only used few times

Unless your Thinkpad and mine differ -- and maybe they do, given that mine has both the traditional and USB C charging ports, so a total of two -- only one of the USB C ports can charge the laptop. On mine, both USB C ports can do USB PD, but one is in/out and the other is out only.