Hi folks, and thanks as always for your candid feedback. We recognize the lack of support for a native OneDrive for Business Mac client is causing serious customer pains. Rest assured, we're working as fast as possible to build it. It took a lot of effort for us to get to a public alpha demo at SharePoint Conference today, and it will take yet more effort to deliver a high-quality customer beta later this calendar year.
We hear the feedback, and hope to share more details later this year.
-Kieran from the OneDrive for Business Product Team