I was mostly kidding, though they do tend to have what amounts to a videowall attached to the trading desks from what I've seen in photos shared by friends working in HFT.

What I suspect is a larger barrier is their paranoia. It'd surprise me if any HFT firm was comfortable with equipping the homes of its traders with everything needed from the bespoke software to appropriate hardware etc. They're very protective of their trade secrets and wouldn't want that stuff sitting around in the homes of employees where it can be either copied or otherwise scrutinized.