Given the CHAdeMO spec has both digital and analog interfaces that the adapter must emulate, it's significantly more complex than the center console (and J1772-AC which some EV have compatibility issues, including the RAV4EV). Also, it only became an official IEC standard in March of this year (and before that published as a Japanese JIS standard in late 2012), so there was many years where it operated as a completely proprietary/closed standard which Tesla didn't have access to (as Tesla is not part of the CHAdeMO association).