He has 500+ open source repositories including very advanced stuff like GPU powered gui framework and game engine components ( https://wieslawsoltes.github.io/Home ). It's very impressive and almost hard to believe that a single person could make all of this, even with help of modern ai agents.
Competent developers have, can, and will out-build entire industries in a week.
Not counting the years before that which he spent using multiple source control systems intensely.
> Not counting the years ...
Never knew a capable/competent developer who didn't spend years.
Unix, C, etc.. constitute other historical examples of having been built in a very short time apart from Linus's git.
With enough competence, it boils down to an exercise in organizing discipline and first principles derivation. As I have mentioned in the past, skillsets at sufficient granularity are transferable across domains.
What you said would be true when looked at each different project as a separate domain, but real world is rarely a collection of isolated domains.
To put that in perspective, our app SlypBusiness has memberships, products, services, gift cards, privilege cards, etc. which all look like different domains to a user but is fundamentally the same primitive instantiated differently.
The real test is if any of it is any good or not.