I will say there’s a kind of escape velocity with portability where when you reach a threshold it ceases to be mere convenience (like in size and weight of carry) and actually changes where and how you use it, just like there a threshold where it gets too big it just falls back to earth and becomes a desktop with a built in battery. It’s why i’ve really grown to like the Macbook 12 over time. Because it can charge using USB-C you can actually use those portable cell phone batteries chargers to keep it running anywhere you are without worry about finding an outlet, and it weights less than a 10.5" iPad with a keyboard case so it’s no effort to take it anywhere. Only maybe a 8" iPad Mini w/ keyboard case beats in portability, and that means you have type the whole time on an 8" keyboard and stare at an 8" screen… eh.
An iPad + keyboard combo still does, admittedly have better usable and standby battery life, but you’re stuck without your programs. I can take the Macbook anyway easily, and the screen is easily the best of anything adjacent to it in the marketplace, making text just way easier to read.
The only usability problem i find is that in daylight - i mean ambient daylight, not direct daylight - the Macbook 12 needs to crank up its brightness to max, and it only lasts 4 hours or so when that bright.