A philosophical question about amps
Building excess capcity makes the device larger, heavier, and most importantly more expensive

it's not that an overpowered power supply can't run a low powered device, it's just that a correctly sized power supply is usually better suited.

sure you can charge a phone from a 5000A capable 5V supply, but finding an outlet to plug it in is tricky and the wheelbarrow to transport it is inconvenient,  much better is a pocket sized 2A charger....