"I use a lot of computing for entertainment purposes and leisure activities"

Couldn't agree more. And phones with a touchscreen have been optimised on this axis (ppi, stereo speakers, fps, oled, latency, etc.)

Examples of logic that you want to last for years: devices you set up for your parents to notify you when they get up in the morning. Or that their air quality and temperature is ok.

By logic, I mean source code that determines the behaviour of the device.