I'm happy to see Microsoft making significant investments in improving the SkyDrive Pro/SharePoint Online ecosystem and service. Yes there is a gap in some areas, but you can clearly see the investment over the last year and particularly the last several months.
As for a Mac client, if you need offline sync and/or the ability to delete content, you may consider a 3rd party SharePoint client for Mac OS - e.g. SharePlus. This type of app still won't let you fiddle with permissions/sharing, but I think it would handles most of the other use cases pretty well. At least it may be viable as an interim solution until we see a "native" Mac app. The other nice thing is that this works with on-premise SP environments as well (unlike, say, the iOS SkyDrive Pro app).