alt Hacker NewsSRE here who has dealt with this before.
Everything in article is excellent point but other big point is schema changes become extremely difficult because you have unknown applications possibly relying on that schema.
It's also at certain point, the database becomes absolutely massive and you will need teams of DBAs care and feeding it.
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x3n0ph3n3 • yesterday at 3:43 AM
Not only will you need a team of DBAs caring for it, but you'll never be able to hire them.
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This is true. But at the same time people need to understand that most companies will never hit that certain point. It's a matter of if, not when.
Everyone tries to plan for a world where they've become one of the hyperscalers. Better to optimize for the much more likely scenarios.