I agree with the above poster. The reason that people see more problems and errors with Windows software is that there is 92% more windows software than Mac software. In a city of 2 million people, more people are going to have a cold than in a city of 100,000. It's a matter of numbers.
Mac computers and software also incur errors (such as when a network connection is not good), but, unlike Windows users, Mac users don't talk about the errors they receive.
Regarding dive computers... Not that many people upload/download their dive computers; probably less than 10%. Thus, if only 10% of the Windows users, and only 10% of the Mac users download their dive computers, then the actual number of Mac users would be extremely small; too small to justify the effort of writing software. Windows software is universal software, while Mac software is proprietory, and it is that way by design. Apple has chosen that route. Unfortunately it has both it's good and it's bad points. Universal software often has it imperfections, but anyone can use it. Proprietary software is often better designed because it is made for only one computer and one operating system. If you buy a Mac, you should not complain to anyone but Apple if there isn't software available for your computer. Apple designed it that way!