Robert Lancer Hey Robert, don’t be mean to “MEAN” stack 😃 (just kidding you). The thing you mentioned with React is called “MERN” stack, is also very popular. Postgres supporting JSONB is good but it cannot replace any of the NoSQL DB’s.
RDBMS and NoSQL are totally different in terms of architecture, use cases etc. Both have their own pros and cons. Please read on how craigslist is using MongoDB - https://www.mongodb.com/post/15781260117/mongodb-case-study-craigslist