Why is Wine separately bundled with Winebottler for Mac OSX?
For anyone stumbling onto this question:

Wine is bundled with Winebottler as it is needed to create standalone Mac app packages (this is how winebottler works, unsure why it cannot use vanilla Wine (stable) app).

So, both are needed:


Wine (stable) installed via winehq to run Wine applications
Wine installed via winebottler to create standalone Mac app packages