Is it technically possible if I wish for a time when I can switch between different OSs on a single machine with a smooth ease just like switching between workspaces or opened applications?

Wishing for it would be technically possible. Been wanting the same thing for years.

One option is using virtual machines.

Another option: https://youtu.be/D9u1vX-pvLs

I'm not an expert but it's basically impossible.

If you would have Windows open and somehow managed to launch Linux at the same time. They will both overwrite the RAM. You'd have to make sure that they don't. And last, nothing is made for it.

As @8BitOverdose said, you can do it with virtual machines.

Another option is to have two computers running at the same time and use a kvm switch to toggle which computer is the active one.

One can only hope

I guess you could use PCI-E passthrough to two different VMs in a host (small debian or something) then launch it to run them with the monitors given to it

@theKarlisK Well you can at least have a shared drive. That's a great start

You can do this using a hypervisor.

KVM Switch

Um... I guess:
Hotswap PCIe based drives that all share the same /home partition on a separate drive.

Or KVM?