"Assign" as in open an application on a specific desktop. Windows 11 kind of got that (automatically, unfortunately no manual control) for multiple monitors, but macOS has it for virtual desktops too. It'd be even better if it supported something more explicit like i3 layout loading, but it can probably be combined with fancyzones at that point to get that working reasonably well.
macOS also has a way to treat an application (or two, with a split view) as a virtual desktop, where the shell disappears and wouldn't allow you to open additional windows on that desktop. I particularly want this seperation because I put VMs on different desktops, but because the shell is there I inevitably have to drag over some windows that opened on that desktop over after a few hours of mindless use.
macOS also has a way to treat an application (or two, with a split view) as a virtual desktop, where the shell disappears and wouldn't allow you to open additional windows on that desktop. I particularly want this seperation because I put VMs on different desktops, but because the shell is there I inevitably have to drag over some windows that opened on that desktop over after a few hours of mindless use.