Soo... Turns out, if your laptop has usb-c charging and it has several such usb-c ports, you can use them simultaneously.

My lappy has issues with usb-c sharging, i.e. it becomes sluggish when charging w/ usbc (compared to on-battery and charging through barrel plug). Aaaaand Linux tends to occasionally crash if I unplug the charger while it's "awake". I wanted to change chargers, so I figured I could plug in the second one (hoping not to see any smoke) and unplug the first one. As soon as I plugged in the second one, all the lag disappeared and the battery keeps charging.

So if you have an usb-c charger that's too weak for your laptop, try using two of them :D

Never would have thought....