You missed one
Instead of your four, I would suggest that usability is high on the list and when I cannot send a FAX on VoIP, then that is NOT usability. There is a handicap send ing faxes, it won't take them and until the technology is improved, it won't.
I just cannot see people using the phone only when I would like to put in a backup modem on my 'puter for times when my ISP is doing maintenance and having the ability to send/receive faxes is critical in a home office. Get the services working and then talk about all the BS you do in this article, but until then, let's concentrate on the "Emperor's New Clothes"