I have been had several experiences in a professional environment where contact is initiated by e-mail or via some form of social media (LinkedIn, WhatsApp, ...), where the person on the other side asks for a phone discussion. The reason they give for wanting to have this phone discussion is to ask some trivial questions that I feel could easily be asked and answered through a single e-mail or via the same chat where the contact was initiated.
In general I usually prefer text communication since I can't always speak freely over the phone, especially during work hours when I have to avoid bothering coworkers. Another factor is of time zone differences and then there's the fact that I often can't really understand people very well over the phone. Often, the sound quality on a phone call is too low for me to discern words well.
I sometimes get the impression from people that they are bothered by the text exchanges. I personally reserve the phone discussions for subjects that need an expedited response.
Is it generally seen as unprofessional to have a conversation over text messages? Is it less ergonomic for these people to type their questions instead of speaking them over the phone?