I officially have a copy of pycharm and not webstorm. I use it to maintain both a python repo and a typescript repo. You can install language support for almost every official jetbrains language into basically any jetbrains editor. The only differences I have found are the default plug-ins and the app icon.
Are you sure that works for all languages? I think it's just that the Javascript/Typescript plugins are made available to all IDEs.
It certainly used to be (and I believe its still the case) that the "major" language plugins besides JS are only usable in their specific IDE or in IDEA Ultimate (which can run all of them) (i.e. PHP w/ PHPStorm, Ruby w/ RubyMine and Python w/ PyCharm)
