I worked as a Nurse Practitioner (not in a GP surgery, but alongside) and my work was not routine. My speciality was children, and I took a much better history, taking time and understanding some of the complexities of life with children. I could observe for longer and notice things that doctors didn't have time for; I explained treatments, how best to administer, and took time to find out was was working well (or not, which can be important).
I was able to prescribe, and to have direct admission to the paediatric ward if I thought it necessary, and I would also advise on the best referral route.
I would perhaps describe PAs as more 'routine' work as they are used in GP surgeries. I do actually think that history taking and triaging is one of their most important uses.
Some PAs can prescribe, it depends on the set-up.
I am aware as I write this that I am basing this very much on my own experience, and maybe that is very different from the experience of some posters.
I suppose I wanted to make the point that we need medical teams, not just GPs to offer an efficient service, and poor practice doesn't help.