It's a symptom of the system as a whole not working well enough, not necessarily the clinic.
People don't book long enough appointments due to cost because the rebate is too low, doctors need more than 15 minutes to properly document visits or fill out paperwork, good GPs will be proactive with things the patient didn't come in for, people show up late, emergencies come up, etc. etc.
My GP charges the same gap fee no matter the length of the consultation, so I usually always book a double to hopefully at least give them a few minutes of their time back.
This is one of my personal and useless gripes with hold music selection.
We're dealing with a narrowband medium designed for the natural range of human voice, why the fuck are they choosing high pitched string and woodwind instruments or "wide" orchestral pieces that only sound good if you can hear the bass?
Centrelink you're probably the biggest culprit, this track is an absolute disaster over the phone.