I always noticed that "shall not be infringed" had no target. It was not "Congress shall not infringe" or "States shall not infringe." It is a blanket statement that no such infringement can occur within the United States of America. Plain text to me says no incorporation is needed, as it always applied.
Quite, as contrasted with "Congress shall make no law..." which DID get incorporated to the states, despite being directed squarely at Congress alone. Good catch.