I suppose that by CAD you mean mechanical CAD, with which I have less experience. On the other hand electronics CAD had been run mainly on Solaris decades ago,

I suppose that by CAD you mean mechanical CAD, with which I have less experience. On the other hand electronics CAD had been run mainly on Solaris decades ago, but for the last 20 years Linux has been the most likely host, including for the most expensive commercial professional solutions. I have never heard of anyone using macOS for any kind of electronics design.