Why? Because you can end up with a single machine than having have to constantly worry about having same environment and data and all that between multiple machines.
If you plug in your laptop to an external monitor and a keyboard, you essentially get a desktop, except you can take it out there with you without worrying about leaving any data or config behind.
If you plug in your laptop to an external monitor and a keyboard, you essentially get a desktop, except you can take it out there with you without worrying about leaving any data or config behind.