It's probably fair enough for a dietitian or specialist to be involved in prescribing specialist formula - this (in theory) means that someone with expert knowledge diagnoses a nutritional issue if a baby is failing to thrive/throwing up/ is in pain, and these symptoms are not the result of some other health problem. It also means (in theory) a baby on a non-standard formula is monitored by people in the know, so any improvement/deterioration becomes better known.
However, I think it is crazy that Issywoo's baby's tongue tie could not have been treated, so the baby could have remained on breastmilk. It is very difficult for mothers to find treatment for their baby's tongue tie, and very difficult to express long term and maintain a good supply.
As a result of all that, we have a baby who develops clear health problems on regular formula, whose mother has had to get advice from an internet forum on how this might be overcome, finds the solution herself as a result of this advice....and is unable to get health service support in meeting the extra costs arising from this medical problem.
I think 'the system' is right to be cautious about prescribing, though. We now know the potentially serious risks of soya formula, but it is there on the list, and difficult to remove. Other non-standard formulas may have risks we don't yet know about, so babies on non-standard formulas should be carefully monitored. I include Omneo in this but it is on sale for parents to buy off prescription, so advantages and disadvantages just aren't known.