You lived somewhere and are speaking for the whole country... I live in Zurich (the city) since 2015 (and my wife since 2018) and we have the opposite experience. Small talks with strangers and totally open converations with swiss people if you want. But you have to be open for it. If you are an introvert yourself, people mostly just respect that and cut conversation to a minimum.
And yes, Im speaking mostly for Zurich City as part of Switzerland, not Switzerland as a whole.
And yes, Im speaking mostly for Zurich City as part of Switzerland, not Switzerland as a whole.