You won’t get answers to questions 1 or 3 because as employees of a publicly traded company Trimble staff are prohibited from discussing plans or future releases. The complaints about these items have been frequent and loud enough that we can hope Trimble is listening, but that’s about it.
I believe the answer to 2) is no, at least not the same way as under Windows, though I use Layout so rarely that I wouldn’t claim expertise.
The answer to number 4) will depend on the sort of models you want to work with. Every virtual machine environment introduces some overhead, and when the software makes heavy use of system calls, the difference can become evident. The models I design (woodworking) are relatively small and simple compared to what some people create, and for them I have found the performance under Parallels to be quite adequate on my 2012 MacBook Pro Retina - though I run that way only when I need to teach someone about the UI on Windows and the differences on Mac would be confusing.