Of course it's a relative argument. Everything is.
I don't personally travel with a laptop unless I plan on working remote. Too heavy/bulky and more importantly, you need to take them out going through TSA. The e-reader doesn't need a charger for the 2-4 weeks I usually travel. If I'm traveling longer, I'll bring a single additional USB cable (that will go away the next time I upgrade).
A phone doesn't take bag space because it's always in my pocket, but it's significantly less ergonomic and much less power efficient for reading. The value-add of being able to read without draining battery on my most important travel tool is worth it on its own.
I don't personally travel with a laptop unless I plan on working remote. Too heavy/bulky and more importantly, you need to take them out going through TSA. The e-reader doesn't need a charger for the 2-4 weeks I usually travel. If I'm traveling longer, I'll bring a single additional USB cable (that will go away the next time I upgrade).
A phone doesn't take bag space because it's always in my pocket, but it's significantly less ergonomic and much less power efficient for reading. The value-add of being able to read without draining battery on my most important travel tool is worth it on its own.