He did say he's not an expert. If anything it's meant as advice for others with small projects. "I'm trying to stay humble. Mongo must be an incredibly big pro

He did say he's not an expert. If anything it's meant as advice for others with small projects. "I'm trying to stay humble. Mongo must be an incredibly big project with lots of nuance. I'm just a solo developer and absolutely not a database engineer. I've also never had the opportunity to work closely with a good database engineer. However I shouldn't be seeing improvements like this with default out of the box PostgreSQL compared to all the things I tried over the years to fix and tune Mongo." But I would not assume that people in bigger companies are always experts in what they deal with either. It kinda matters how well something performs in non-ideal scenarios.