[deskamess]

Yes, learning other paradigms is useful.

For me, introducing immutability of data (functional paradigm) helped clean up many interfaces and made the code feel resilient. I realized I rarely passed the input data back to the caller (it was often a new and different structure). At the end of it all, I was somehow more confident in the 'run time' of the app and reasoning about issues is much easier. Currently I am not using any language features to enforce immutability - I just code the receiving function to not change any input structures (or in rare cases, return a new one). I suspect there are some exceptions lying around but having most of the code behave this way has helped.