As to whether a charger is too powerful or not, you can always use a charger greater than or equal to the maximum power draw of the device. This applies to all chargers (USB, barrel connector, etc.), not just those that conform to the USB 3.x specification.
30 Jul '21
USB-C conforms to the USB 3.1 specification. Part of that specification is the Power Delivery spec. This means that the device and charger will negotiate the power that is delivered.