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The general attitude here reminds a bit of the following post from the architect of the Varnish proxy. I think the attitude comes down to the fact that modern kernels and in general the foundations of network programming are pretty strong. We should trust them more.

https://varnish-cache.org/docs/5.2/phk/notes.html

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I would argue you can say the same about foundations of rdbms systems as well. People build similar elaborate caches around those, for example rails has a “russian doll” cache layer built in, not realizing how much time has gone into developing well tuned caches within the database system itself, which simply needs to be allocated sufficiently large ram.

Russian doll caching also caches view rendering which can be non-trivial in Rails.

> not realizing how much time has gone into developing well tuned caches within the database system itself

File systems too. A cron job writing a csv makes a surprisingly simple cache the OS can keep in memory.

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