USB-C works without USB-PD. Plain USB-C is simpler than USB-A since it supplies 1.5A or 3A based on resistors. The USB-C to USB-A and microUSB adapters are just

USB-C works without USB-PD. Plain USB-C is simpler than USB-A since it supplies 1.5A or 3A based on resistors. The USB-C to USB-A and microUSB adapters are just resistors to use legacy USB. Legacy USB power is fairly complicated with different standards for 500mA, 1A, and 2.4A power. The reason it looks simple is that cheap chip is in every charger and device. You can probably provide at least 2.4A 5V on USB-A, just like providing 3A 5V would be fine with USB-C.