React is both bigger (in terms of bytes) and more complex than Angular.
So, to answer your question, React is more complex than just about everything. I’d like to see you find a more complex framework.
We can run other executables on our local. The web itself is the problem and what needs to die to give way to something new.
But something like Figma, Slack is indead a huge hack in terms of technology, but it would be way less code and more performance to just have native desktop apps.
I genuinely don't understand how Angular is considered simpler than React.
Both have a build step. React hasn't needed a "generator" for years now (if you mean stuff like CRA). With tools like Vite or RSBuild, it's like 2 lines. Yeah, the JSX needs to be compiled, but so do templates, custom CSS dialect, and TS's old/non-standard decorators in Angular.
Angular has way more quirks and reactivity foot guns than React. I think major React adoption painpoint is hooks, but while they are clunky, they're way "easier to hold" than most Angular tools.
Same when it comes to state management libraries in angular, but I digress.