Just slapping the "the other end is 3A capable" resistor onto the cable isn't good enough, because a cable has no idea what's on the other end.
You can still rapid charge with a compliant type-C/A cable, but it needs to be negotiated through one of the other specified mechanisms (that directly talk with the other end and thus can figure out what the type-A charging side can actually provide).
You can still rapid charge with a compliant type-C/A cable, but it needs to be negotiated through one of the other specified mechanisms (that directly talk with the other end and thus can figure out what the type-A charging side can actually provide).