[Demiurge]

I've seen badly written scientific Python code, and I've seen very badly written enterprise Java code. I’ve also written probably more than hundred web apps using Django, that never needed to be written in Java. And Django is great work of software engineering, having not much to do with scientific software.

Some apps need to be re-written for performance reasons, or optimized, that is however, not the most common case.

For all the companies that are complaining about the performance issues, I suspect they are complaining about the change of their incentives or circumstances, unless they made an uninformed choice with choosing Python to begin with.

Which is the likely case?