I guess, efficiency and batteries will improve, so the devices will last much longer than now. Maybe even efficiency will great enough that the whole energy can

I guess, efficiency and batteries will improve, so the devices will last much longer than now. Maybe even efficiency will great enough that the whole energy can be harvested from movement or environment and we don't have to charge the devices at all. Type of user interfaces might also be improve a lot. Think about a device that maps "images" directly in your visual cortex, so no need for displays anymore. Or holographic projections instead of screens. Much sci-fi today but potentially reality in 20 years. Also the way we communicate with the device will drastically change. We already have AI language models and good speech recognition but these are in a very early state. I assume such things will improve a lot and will be integrated soon in consumer devices.