I think the main issue with trying to learn too many languages is that it is exceedingly taxing on your memory capacity. Being a regular developer in a language

I think the main issue with trying to learn too many languages is that it is exceedingly taxing on your memory capacity. Being a regular developer in a language comes with a lot of context that you have to keep in mind. This gets hard to do if you are constantly switching between languages/frameworks all the time. So there's definitely some balance that is good to strike between learning a greater number of concepts and paradigms vs going deeper into fewer languages/frameworks.