I know some people use them. On paper, it sounds like a good way to avoid the mess of dummy plugs, or setups like mine where I have to unplug video cables from one miner and move to the other to check stuff out!
Right, that's the idea. My setup is a total mess, and only 3 PCs. I am putting together a Rack for all equipment and would love to get away with a single LCD, Keyboard, Mouse. But I don't want it to cause my GPU / miners to stop responding as a result.