> Are class components really on the down & out The hook system is the parts of an OO system that React needed to be able to keep developing features & optimiz

> Are class components really on the down & out The hook system is the parts of an OO system that React needed to be able to keep developing features & optimizations for function-based components, rather than telling their users & devs that they'd simply have to use classes for some things. It exists so they could side-line class components, rather than having to become outright reliant on them for some features. So, pretty much, yes.