[arp242]

"2-5x times slower" can mean the difference from 2 seconds to 4 to 10 seconds. Two seconds is still (barely) acceptable for interactive usage, ten seconds: not so much. You're also going to need less beefy servers, or fewer servers.

I also "just" use PostgreSQL for all of this by the way, but the limitations are pretty obvious. You're much more limited in what you can query with good performance, unless you start creating tons of queries or pre-computed data and such, which have their own trade-offs. Columnar DBs are "overhyped" in the sense that everything in programming seems to be, but they do exist for good reasons (the reason I don't use it are because they also come with their own set of downsides, as well as just plain laziness).