[endymi0n]

Exactly this, I was missing the big picture. Having worked with at least a dozen databases, my claim today is that of Tony Million: Don't be a hipster and just use Postgres. Don't get me wrong, I also work with Aerospike, Redshift, Redis and a few other specialized data stores, but I always know why Postgres wouldn't do there. For any specialized data store, at least provide a rationale where the niche is where that thing is better than anything else that's on the market. Simply claiming it's "fast" without further specifications worked out for MongoDB, but I hope it's for the very last time. Optimization means tradeoffs.