We did the same at one company I worked for. It was a terrible decision.
RxJS is one of those things that is fun to play with until you look down and it's cutting off your legs before you even felt it. Instead of simple AJAX calls when needed in places that are logical, your app turns into this hydra of events flowing everywhere and never knowing why anything is happening or where it's happening. RxJS is what happens when a Jenga tower makes love with a Rube Goldberg machine.
And don't get me started on those damn marbles. We're writing goddamn CRUD webapps!!! We don't need marble diagrams for this. It's like that Mitch Hedberg joke about donut receipts. We don't need to introduce complexity into our simple life.