Re: "the system has a more modern and 'flatter' look"
When it comes to Multi-monitors, workspace per screen is the only way to go IMO.
Definitely! I've always run that way. When XFCE dropped support for multiple screens a few yeas ago, I ended up switching to running multiple instances of openbox+tint2. It works great 99% of the time, but there is still a bug where openbox occasionally locks up the X11 system. That's annoying but not bad enough to make me give up having multiple screens.