With my old ZBook I always had the charging cable on the device, the battery is now over 10 years old and still lasts a good 3 hours. I think the charging is interrupted until the capacity falls below 95%.

Is it really a big disadvantage to always have the Slimbook plugged in?

It annoys me a little to have to plug in the cable every now and then, especially since it is difficult to unplug it every time it is 80%.

Doesn't the USB C port suffer unnecessarily as a result?

I mainly use the Stimbook at my desk with an Anker 737 power supply.