Another disadvantage is typing ... can't type at speed with the on-screen keyboards. Some sites rudely "do stuff" that makes the use of the display area impossible (google is one that uses microsoft level rudeness).

Extension keyboards exist, but that's extra cost, no idea how well they work, also not sure how they affect power consumption.

Some sites have special views for this types of devices, but some address it with special apps (which don't work as well as a regular web interface). Vaguely, I put this whole thing down to "It's going to take a while to figure out the best way of doing this."