Reading your comment, I have the impression you took it as "there shouldn't be any state management necessary", instead of "state management doesn't need a framework" sense.
"Why use a widely popular, well-documented, battle-tested framework? Just have one of your senior devs build something over the weekend. This will definitely reduce complexity."
Like... I get what you're saying. But "build your own" is not a default answer for an extremely complicated software engineering topic (which, yes, state management is!)
But, that led to the community building hundreds of addon libraries for the same sets of use cases, which is what led us to build our official Redux Toolkit package to simplify standard Redux usage patterns.