This piece is written with a pretty cliche dismissive tone that assumes that everything everyone else does is driven by cargo-culting if not outright ignorance. That people make these choices because they're just rushing to chase the latest trend.

They're just trying to be cool, you see.

Here's the thing, though: Almost every choice that leads to scalability also leads to reliability. These two patterns are effectively interchangeable. Having your infra costs be "$100 per month" (a claim that usually comes with a massive disclaimer, as an aside) but then falling over for a day because your DB server crashed is a really, really bad place to be.