I spent a lot of time working on react applications of one kind or another and I think most businesses don’t have “problems that React solves” for their frontends. Somewhere that’s actually an application might, but most line of business applications would be better as something like Rails views rather than React
Because, for most business applications I've worked on, React just complicates the frontend code compared to serving up simple HTML views and for no real benefit aside from "using React"