I've been using my X1C on battery for the last 4 hours on a transpacific flight (hello from the middle of nowhere) and am looking forward to about 4 more hours.

I've been using my X1C on battery for the last 4 hours on a transpacific flight (hello from the middle of nowhere) and am looking forward to about 4 more hours. The seat has a convenient power plug, but it's awfully nice to leave the charger tucked away in my bag to be one less thing to trip over when I have to wriggle free from my cattle class seat to run to the restroom. So, to address your question (which I would normally also ask), it is that important though this is also a somewhat narrow use case.