I remember my mother tksing me to a hairdresser when I was small and my mother was offered tea. The offering of tea/coffee/refreshments happemed a few times since then.
There was a time when I stopped going to hairdressers and so I forgot about it. But I and an appointment last week and I was offered tea/coffee. I declinced because I was only there for a short time (wash and cut and blow-dry and also I had my bottle of water there with me).
I could understand the offering of tea or coffee for a long service if one will be there for a few hours but for a short service like a wash and blow-dry or for a cut, wash and blow - it's only really about 50 minutes.
It's just something I was pondering about.