I broadly agree, but would tweak those numbers a little for small B2B apps: I ran a small B2B application on a cheap VPS using PostgreSQL as a primitive messaging interface, and even on a small VPS 50k DAU won't even cause the machine to break a sweat.
replyi think 1 billion DAU is the exception here, so I would not expect everyone to constantly caveat personally.
replyAgreed, but many of the criticisms I am reading here are assuming high scaling requirements and invalidating the approach entirely. When there are many business domains that will comfortably fit within a modestly specced database instance.
replyEven just B2B vs B2C is a huge split. Plenty of specialized ERPs in the world that have relatively few "butts in seats" users but have a lot of data to work through.
replySize of the data, read/write ratio, number of "requests"... lots of axes that change how much pain or not you're in by just pointing to pg
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