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.