I don't know enough about Angular 2 to know exactly how much of a bad choice that was, but my experience in React has always been "they should have used something else". I vaguely recall our lead backend being unhappy with his decision to do the original admin panel in Angular, but I chalked that up to him not being a frontender.

For context: I begrudgingly adopted Vue a while ago after finding React to be too unwieldy, and part of that opinion is definitely related to a poorly written Redux implementation.