I too have run into this recently at work. IntelliJ for Rust, Dart, JS/TS, PHP etc but I break out Rider for C#. Would be a dream if one day these were combined so IntelliJ would be a true polygot IDE
If you use their flagship offering, IntelliJ, it includes language support for Python, Javascript, and many other languages either directly or via a plugin that replaces most of the respective functionality of Webstorm, Pycharm and Rubymine. Just some niche features (like a C debugger only found in CLion) are unique to the other IDEs IIRC