The biggest issue I run into is that developers wanting to put some one liner hello world example into production. There is no monitoring or logging, nothing updates the operating system or the application environment that runs in it, the hello world invariably runs as root and fails as any non-privileged user, etc. Any sort of database access reads the entire database on every access and loops through them all performing its own query logic - until the database gets too big to fit into ram. It’s a huge surprise when data gets discarded from memcache or redis. Over and over again I see these same issues.