...but that's what Svelte is not. The techniques you adopt won't transfer over to vanilla HTML/CSS/JS without the magic Svelte compiler. These habits will become crutch when Svelte inevitably goes the way of every Javascript frontend framework.
> something complex like React
React is not that complex, certainly not more so than Svelte. It's hard to wrap your head around some behaviors, but at the end of the day, it is really just Javascript/Typescript. It is programming. As a programmer, I want to spend most of my time programming in a programming language, not so much of it configuring the Rube-Goldberg machine that is HTML/CSS. Your mileage may vary, of course.
> this silly side project made in Svelte over a weekend
I will admit, that's what Svelte excels at.
I swear every time I use React, every couple of years, I wind up thinking "okay fine, but... why?"
I love JSX. But the React API, for some areas, feels complex and boilerplatey. I dunno why you have to explicitly memoize some stuff. Svelte just magics that shit away.
> But the React API, for some areas, feels complex and boilerplatey
That's also why in local dev mode, you'll see the render cycle executed twice so that you can spot any undesired side effects due to this design choice.
So a lot of the complexity is to deal with this specific design choice to determine when code inside of the component function needs to be re-executed. In React, you need to explicitly opt-out of reactivity while in nearly every other framework, you are opting-in to reactivity.
For me, I've always seen this as the weirdest footgun because it's antithetical to the underlying language and runtime behavior so developers need to be explicitly aware of this behavior.