What's the point of making an appointment with someone who can't do anything for you?
How do you know they can't do anything yet if you don't see them? Also I know in my area now it can be a year/18 month wait to see an NHS orthodontist, so dentists are deliberately referring patients early so that they get to see the orthodontist by the time they need the treatment rather than waiting till that point to even get put on the list.
I had braces from the age of 10 because all of my adult teeth were growing in, but they were crowding at the front and had started to cross over each other, and had they be left it would have got even worse. When I was first referred aged about 8 it wasn't an active problem yet but I would have serious issues in the future if nothing was done, so while the orthodontist couldn't start treatment, he could keep an eye on my teeth and chart the changes so he could decide when I was ready to start treatment.
On my first visit the orthodontist basically just took X-rays, teeth moulds and made notes as to the placement of my teeth in my mouth and then made me an appointment for something like 6 months time. Again at that second appointment, he did the same and compared them to the records from last time to see what progress my teeth had made in that time, same again for the third appointment and it was only on around the fourth appointment (so around 2 years after I had first seen the orthodontist) after he had done the same tests and looked at the results that he said I was ready to start treatment.
Originally he had said that it might take up to three years before I needed the braces, but because he was keeping tabs on their progress and I had regular checkups with him, he had seen that I was ready after only two years, and had it been left another year I would have needed much more work and invasive treatment. By this time all my adult teeth had come through and he could give me removable retainers to try and slow down the crowding, and on my sixth or seventh appointment I got a couple of teeth removed and my traintrack braces fixed that stayed for the next 2 1/2 years.