"At no point did anyone let me know why there was a delay"

Had an appointment this morning. Arrived and checked in on time. Waited half an hour to be seen.

I was the first patient of the day - when sat in waiting area could see staff chatting and making cups.

At no point did anyone let me know why there was a delay.

Once called the clinician told me she had had a problem with the "technology". Could she not have come and told me there was going to be a delay instead of just letting me wait getting more and more angry, and stressed.

I am a healthcare provider and have had to take annual leave to attend the appointment. if I am going to be late for an apointment I ring the client and explain. Surely this is only polite?