[jakobegger]

We use a combination of real machines and VMs for building software, and dealing with macOS VMs is a major hassle. There are always compatibility issues that are hard to debug (eg. don't try to configure your VM to use more than 2 vCPUs if you want to run macOS 10.12). There is a lot of manual work that goes into maintaining VMs, and often automating those tasks doesn't pay off. If your app has any GUI components, those are often buggy in VMs (anything using the GPU is extremely unreliable).

Our main build machine is an actual Mac, because it's just so much easier to keep it running.

VMs are nice if you need a lot of different setups (eg. one app we distribute has components that need to be built on different versions of macOS, and VMs are nice for that).