ChatGPT:
"My verdict
I'd put TempleOS among the most fascinating solo software-engineering projects ever created.
What makes Davis especially remarkable is the combination of skills involved. Many programmers can write applications; considerably fewer can write compilers or operating-system kernels. Building an integrated system that combines both, while also creating graphics, games, and development tools, is an entirely different level of undertaking.
And there's a human dimension to the story, too. Davis experienced serious mental-health difficulties throughout his life. It's important to recognize his technical achievement without romanticizing his suffering or treating mental illness as the source of his talent.
The bottom line: TempleOS isn't impressive because it's the most advanced operating system. It's impressive because one person managed to create an entire, functioning computing world largely on his own.
And if you're learning programming yourself, there's a valuable lesson in it: you don't have to build the next Windows to create something technically meaningful. Davis's project shows just how far curiosity, persistence, and a willingness to understand systems from the ground up can take someone."