What's t3?

Hi there,
so I've been watching Theo's videos because they are very interesting and he covers topics very gracefully.

So what's the "hype" about T3? Because everything he does is T3 related.
It's a stack but I haven't found WHY he uses the things he uses.
Why is he using NextJS and not Astro for example?

I'm really a vanilla guy, so if it exists in vanilla I use that, aside of for example Gsap and similar stuff, but I do really prefer vanilla. Sure DB modules and a backend server Bun + ElysiaJS is what I prefer, maybe some EtaJS going with it.

For me this whole React aka JSX is complete bloat. What's so hard to choose a template aka EtaJS or EJS and use that?
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