I'm also curious if Overwatch works in this release. I couldn't get it to launch with Wine Staging on MacOS a few weeks ago.
macOS doesn't support Vulkan either, so DX12 and Vulkan based Windows games won't work there in Wine as well (while they can work in Wine on Linux).
TL;DR: Linux is a much better option for gaming in Wine than macOS.
Why would it be improbable that someone switch from Mac to Linux due to game support? Where Mac already has far worse support than windows and in some respects is more like Linux. Shouldn't the leap be lower from Mac? OK I give you that I am not taking into account the Mac user mindset.
And reasons for switching to Linux are from discussions with Wine users. If you are one, you should have encountered this topic already. But I assume you aren't using Wine for gaming, thus your question.