Technies almost always have a laptop, phone, and home desktop up at once, often have some media/fileshare, and then there are VMs to further the complexity.
Here's what I've been wanting for years: a big ass 8k wraparound monitor, and it has clickable widgets in the desktop to turn on the computer/VM and activate the display feed into some part of the desktop.
There's a primary desktop area, and that area is surrounded by "neutral zones/buffer zones where if you take the mouse into that area and click on it, it would swap the "primary" area to that machine and place the former machine's display into one of the peripheral areas of the large display, or secondary monitors.
With "cores to spare" in modern Moore's law scaling, I should be able to have several OSes seamlessly running at once, not the virtualbox stuff or other clunkiness, a much more seamless experience. There's a lot of hardware/CPU features to support it, but of course the OS vendors/distros have no prioritization to do something like that. It's also a fundamental failing of IoT.
We are all moving towards a world where we have a dozen decent-class computing devices (Multicore multiGhz phone, 2x that for a tablet, 2x that for a laptop, and 2x that for a desktop) even not counting IoT, media, etc.
We need a truly distributed OS that can handle this stuff. Windows/Android/iOS/OSX won't do it, they are in the walled garden business we need Linux to do it. The cloud projects, k8s / etc wanted a "datacenter OS" but basically failed.