No, our app didn't use JOINs for the main work. But, as I wrote, every now and then we had some one-off requests that required either JOIN or GROUP BY or both.

No, our app didn't use JOINs for the main work. But, as I wrote, every now and then we had some one-off requests that required either JOIN or GROUP BY or both. With postgres+JSONB we could do both at the same time on live data.