> Sure, we're all just talking about our personal experiences. I just haven't run into the problems you describe. I use virtual environments to keep my system i

> Sure, we're all just talking about our personal experiences. I just haven't run into the problems you describe. I use virtual environments to keep my system installation clean, and PostgreSQL / Nginx are so stable that the version I happen to have on my dev machine usually works with all my projects dating back to 2014 (but kept up-to-date). One of the most important thing docker provides is an abstraction between the application and the OS. If you don't need the abstraction, then it's only going to look like cost. On the other hand, being able to write an some code in python 3.9 and deploy it anywhere across a heterogeneous production environment without fighting with the OS about how many versions of python it has installed is a useful thing.