Why would I want to use any pc in the world? That makes no sense unless your work doesn't involve security of any kind. Besides you can carry your work environment using a virtual machine too.
Perhaps it (any pc in the world) is an exaggeration, but I can use my phone, personal laptop, work desktop, work tablet, personal tablet to connect to my always running tmux session and pick up where I left of.
And a virtual machine seems portable, but I cannot use it on my phone/tablet, and I also cannot use it on most other machines that don't have that virtualization software installed.