Exactly.
There is nothing different about hair, beauty or restaurant work that makes it worthy of a tip, compared with fast food service, care work or even retail work.
The wages are about the same, the type of work is about the same, in many cases, the 'personal service' aspect is about the same.
Yet there are people on here calling people nasty names for not tipping.
Someone on a similar thread posted an example where a customer in a restaurant didn't tip and the server called them out on it. The customer said. I work in a care home and care for your Grandmother. We both earn NMW, I wash and dress her, take her to the toilet, feed her, chat to her, bath her and put her to bed daily and you don't even recognise me or acknowledge me when you visit. Yet you expect me to throw you an extra couple of quid for carrying a plate of food across a room to me. Whether or not that is true, it illustrates how illogical tipping is in the UK.
Also, DP used to work in quite a high end bike shop. He would often spend up to an hour helping a customer choose the right bike, fit the seat, advise on clothes etc etc and the customer would often spend thousands. He was paid NMW, no commission, just a discount on goods he couldn't afford to buy. Very very occasionally, like twice a year, a customer would bring them a crate of beer to show their gratitude, but apart from that, not one penny of tips was ever offered.