"Nobody uses just React+Express w/o TS for something serious." Hardly. Just search for "(react.js or reactjs) (nodejs or node.js)" on indeed.co.uk. 441 results. Now append "-typescript" to the same search. 378 results. It appears Typescript hasn't yet taken over the world.
Most companies using typescript don’t advertise for typescript developers and will simply look for JS decelopers, because the belief is that anyone should be able to transition from JS to TS so why limit your scope.
