1 - Hardware acceleration can be used if you use the right virtualization tool. 2 - Not really. On paper perhaps. On real life not really. I had Apple support

1 - Hardware acceleration can be used if you use the right virtualization tool. 2 - Not really. On paper perhaps. On real life not really. I had Apple support live via screen-sharing and it was about my app (well, my client's app) on their store. They couldn't care less that I was running High Sierra on a VM. Maybe because the project I was working on was a successful app that was bringing revenue to them (and my client as well)? In the end money talks.