alt Hacker NewsBlow made his own language because he's so eye-wateringly arrogant and thinks every language (that he didn't make) sucks, and only he is smart enough to design a better language for programming games.
Seriously, this is why he did it. His ego and arrogance is off the charts and if it wasn't made by him, he thinks it sucks (e.g. he doesn't like Linux, probably because he realizes Torvalds is actually smarter than him). He also doesn't like C++ or Rust, again, it's probably a good indicator he has a deep inferiority complex and so he has to prove he's the smartest person in the world by writing his own, "better" language.
I.e. I don't think he's making a programming language for some "love of creating", I think he's doing it because he has a deep psychological issue/insecurity, which drives his need to always be the "smartest person in the room", his arrogance, the way he dismisses others who don't agree with his viewpoints etc.
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C++ & Linux are world-changing tools, but C++ & Linux really do suck in ways that become more offensive with taste. Rust makes very different tradeoffs than ones gamedevs want.
Regardless, if arrogance drives people to make new tools then we should be grateful for that arrogance.
I think you're projecting a lot of your own complexes and insecurities.
He built a language for a very specific task: building games. There were quite a few requirements for such a language. Opinionated? Yes. But that's how you get new languages: by having opinions. Along the way he changed the design and the assumptions several times (e.g. built-in SOA structures are gone) while keeping the original goal in mind and using it to build a custom engine and a game while building the language (thus validating the choices made).
If/when Jai is released hopefully sometime next year, I do hope the documentation includes the rationale because he talked a lot about why other languages don't cut it in his opinion in the early days of development.
This is a very reductive take.
Even if you don't like Jon, calling Jai an exercise in arrogance is simply untrue. When he started making Jai in ~2014, there were very few viable alternatives to C/C++ in the systems programming space that offered the kind of expressive power becoming of a langauge built this century. Rust is great, but it prioritising correctness is not always the right choice, especially not for games. Jai introduced many ideas that languages like Zig and Odin ended up adopting.