It's the same for me. I understand that people do want to use them without plugging in, but I would imagine at least most developers prefer external screens, right?

For me the battery is good enough when it can last two back-to-back meetings without me getting worried, so about 2.5 hours. Otherwise it stays plugged to USB-C.

I have a portable external screen that I carry in my backpack when I travel and when I work away from home.

https://a.co/d/6P7gfGA

And this stand

Metal Tablet Stand, a Portable... https://www.amazon.com/dp/B0C4KH2GH3

The monitor is both powered and the video comes from one USB cord. My MacBook Pro can run 5-6 hours while powering the monitor. I couldn’t do that if the laptop by itself only last 3 hours.

Every now and then I use my iPad as a third monitor.