Installing every Arch package
Surprisingly, yes! It's hard to judge how bad the performance really is, since it's in a virtual machine, but all the software that I tested was definitely usable. It's somewhat slow, but that's exactly what you'd expect. As we used a lot of unsafe hacks (disabling dependency and file conflict checking, for instance) to get this to actually work, I wouldn't recommend using this system for anything other than proving it's possible.
Now is this useful? The short answer is no. The long answer is also no. I can think of exactly zero uses of this experiment (and I must be pretty crazy for doing it).
This is the kind of nonsense computing I can get behind.