in my case it runs on a good old server.

> So your Python code without modidication can benefit from it.

that's not completely true though, say you have two python processes, you need to solve yourself how they communicate, HTTP? a message broker? through the DB? You need to handle errors, stateful deployments.

You can deploy python code without modification if the python code does very simple things. My point is that the BEAM gives you a lot of this mostly presolved for you without having to add more infrastructure.