The following is from the link you posted:
Integrated Airplay and Chromecast* – easy streaming from Apple and Android devices
ROON Ready functionality to be added in a future update.
NAA operation in conjunction with Sygnalist’s HQPlayer software
*Chromecast to come in a future update.
Them there’re are updates.
Development would mean that the machines working interface was incomplete, that there were potential issues with its functioning.
What you have mentioned are add ons.