No, that's the point, that's not it!
You are either a Windows user who knows little about the Mac, or a Mac user who is massively simplifying and understating the issues in a corporate environment.
You need to read the entire thread and see what the limitations are.
The main one being that you need to restart your machine to use other applications, and effectively lose your multitasking, or you throw away your Mac software and OS, and purchase Windows replacements for all of it. Not all of these things are immediately obviouls or straightforward. For example if you want to sign PDF forms or append pages to PDF files, you buy more software or restart.
And then you have to purchase the OS and all the antivirus/antispyware stuff, MS Office and everything else you use.
If Revit was maybe £1000/$1500 cheaper for Mac users to cater for the cost and inconvenience, that wouldn't be acceptable, but it wouldn't be compltely and utterly unacceptable.