Ticket support has an audit trail of communications. Phone just doesn't have that unless you record - which a lot do. However, posting recordings is a lot different than emails which can redact sensitive information (not impossible just easier). Plus changing the voice on the other end of the line would be even harder.
Sure, all relevant and pertinent facts can be passed on to whoever may be working on fixing your problem.
It's just easier with tickets.

Anyway, just my 2c on tickets. Not really relevant, but I had a problem who only spoke Portuguese and wanted phone support. I refunded him after he said he "no English" on the phone.
Google Translate jumble things when translating