I just picked up a violin for the first time in what must be 25 years. All that time ago, I had lessons and playing in school orchestras - but moved on to other instruments.
As a beginner I would use open strings to play the corresponding notes.
As a more experienced guitarist/bassist I often avoid open strings, because when fingering a note with the left hand, I can add vibrato, muting etc.
Violinists do a lot of vibrato. Would a reasonably advanced violinist play any open strings at all?