Yes, but AutoCAD is a generic CAD tool. Nowadays we are moving from generic CAD to specialized tools, such as BIM tools: Revit is not available on Mac. Nemetschek BIM apps are not available either. ArchiCAD is available (but you are not going to convince users to move from Revit to ArchiCAD if they wish to use Macs). Structural engineering apps are completely missing in Mac. No FEM tools either... the Mac is really lacking in engineering, but quite a few architects and engineers bought MacBook Pros and used Revit, SAP2000 and other engineering software through BootCamp. With the move to ARM, these customers are left out.
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You will be closer to reality if you consider that what Apple cares about is not the number of users in each platform, but achieving the largest possible number of users in an OS highly friendly with subscription-based business models: They consider the Mac as a platform that is not important for long-term success, because the current Apple long-term strategy is based in having control over the user's device (and iOS shines here, contrary to MacOS). In other words, they want to turn the Mac into something that behaves just like a big iPad: don't let the user tweak the OS, don't let the user keep a version for software compatibility, favor subscriptions, etc, etc, etc... It's not a matter of how many users use BootCamp (they are consider not beneficial in the long-term), but on maximizing the number of users whose device can be controlled by Apple.