Chrisfarrugia is right, Its more about having your domain hosted directly with office 365..
Even if Microsoft thinks it will be abused if they make 365 home with domain support, being cheaper than other offerings per user - make it so personal accounts can use there domains, Not everyone wants to use Sharepoint, Lync, Onedrive Pro, and the more
business looking and functioning outlook online.. but still want to use there current email setup.
The advantage that Google for Work has is that when you use it or a normal Gmail account they function / look the same, you still get your nice interfaces, same online applications Just with paid support and domain functionality..
Also i see a lot of people confusing outlook online, Office 365, and other terms regarding the new Microsoft systems with one another. I have even seen people on these forums that workfor Microsoft that don't know what us lot are on about - Continuing to
refer to OUTLOOK (The Desktop Application)
Feedback from Microsoft would be nice.....