Wine/Proton: https://docs.freebsd.org/en/books/handbook/wine/

NVIDIA: https://wiki.freebsd.org/Graphics#NVIDIA_graphics

OpenBSD is not too great at that, but that’s ok.

Most of them should be available in the native ports/packages. The porters community is rather active. I guess that proprietary applications like Softmaker Office won’t work (they usually refer to specific library versions), but everything else could be worth a try.

That said, FreeBSD and OpenBSD support virtual machines just fine.

It is amazingly resource-friendly and its SMP is being optimized.

No, for speed and/or gaming, I’d recommend DragonFly BSD (or FreeBSD which has a built-in Linux emulator that could - in theory - run Steam). For development, however, the BSDs are generally quite friendly. Note that the BSDs usually use Clang and a POSIX shell (or tcsh) instead of GCC and bash, so you won’t have GNUisms by default.

In many ways.

OpenBSD master race.

A few thoughts on this:

• Debian is, in my opinion, oversized for an OPZ2. If it absolutely has to be Linux (does it?), Alpine or Void might be worth a closer look.
• Why SFTP? Wouldn’t SCP be enough?
• Automatic updates are risky for a device that is supposed to run always. Instead, I would recommend sending update notifications and then manually applying an update from time to time. If the device no longer boots up, you often don’t even notice it.

As far as I know, these parameters are added by Google.