Well, yes, but then, I'm using an external display for that particular PC, regardless if it is built into the device I'm using to access it.

These days I play mostly on two laptops. One of them has a 17" screen and that is good enough for strategy, RPG, simulation, the odd adventure and whatnot. Now and then I connect it to a large screen to play from the couch with a controller. Games that work well for me like that, like Rebel Galaxy Outlaw, Vampire The Masquerade Shadows of New York, Sleeping Dogs, or Mad Max. Develpers, remember to make the interface scalable and everyone will be happy.

The other is smaller and lighter. When I play with it, I always have it connected to a larger screen, but I would play without one if I felt like that and did not have a larger screen.

I use a desktop. The screen on the side is capable of displaying brilliant colours, but doesn't convey information very well.

that's just silly. :P Not that it could never happen, but we're getting into some pretty bizarre setups for this to take place.

Perhaps if the user of that computer is blind, and therefore has no use for a conventional display?

True.

I've had laptops with broken screens before. Rather than replacing the screen I deactivated the built-in screen and run them closed, so now they are desktops, or displayless network devices such as the SSH setup OP described in post 45. :-) Same treatment for tiny computers such as Raspberry Pi/IoT: usually I run them without displays or peripherals, just network access. I've also used tablets, IoT, and laptops with HDMI ports connected to my TV, and the dual-screen setup with a laptop and monitor. Oh, and "casting" videos from my phone to friends TVs (perhaps the most annoying variant of Rickrolling yet invented). In short, yes.

The vast of majority of my time spent with computers have been desktops with external monitors, whether it be my own those those belonging to the schools. I have been using the same monitor for nearly 10 years, the desktop I that originally paired with has stopped working years ago.