1. You could make the same argument about fridges, electricity, light bulbs, vehicles (yours or by proxy), houses, chairs, agriculture. The point is that not having a smartphone available to you puts you on the margins since at this point it's assumed that everyone has one. Every restaurant in our area is now doing virtual no-touch menus that require scanning a QR code and requiring online ordering for take-out. Like you can live without a smartphone but at this point you're only making life more difficult and annoying for yourself.

2. It's plenty enough. Phones have been plenty fast for years. The issue is finding a vendor that will support your software for long stretches of time which right now that is community Android distributions and Apple.

3. This is a bad-faith argument and you know it.