It's a lot easier not to be vested in old technology when the replacement runs for longer without new infrastructure and doesn't cost a couple of months' wages to upgrade, a few more if the old technology is rendered obsolete...
Smartphones still don't run as long as 2006 dumb phones. People just noticed that was a rarely used feature.
That's a problem for trucks and buses though.
They have a different Problem and might need a different solution. Hydrogen might be cost effective at truck-scale.
Compressed natural gas is used in some buses right now.
I'm convinced that ammonia will be used rather than hydrogen for these applications, but it amounts to the same thing.
This is patently false. If you turn off your WiFi, 4G, Bluetooth and NFC, and only use your phone for calls and SMS, a smartphone can easily last a week. More than a dumbphone with the same features.
Agreed. You can also lower the brightness of the screen when you don't need it. My Sony Xperia Z5 Compact in "Stamina Mode" (basically what you're describing) can last for 7-8 days as far as I can tell.