He probably meant "usable OS fit for mass market adoption". Of course one person can develop a bare bones OS, but this will be missing so many things compared t

He probably meant "usable OS fit for mass market adoption". Of course one person can develop a bare bones OS, but this will be missing so many things compared to established systems, while providing too few advantages, that any wide adoption is impossible. Even Microsoft, with well over a thousand (IIRC) Windows developers, had to scale back their Longhorn plans substantially.