I fail to understand why GPs don't seem to know this, especially as iron issues seem to be so common.
I honestly think it's because until recently we were taught that if your Heamaglobin is OK, then it didn't really matter what your Ferritin was. No concept that Ferritin might do stuff in the body eg make you grow hair, or feel less tired, I think we thought it just sat there waiting to be turned into blood cells.
Then given how many things you have to keep up to date on, prescribing iron which seems like it's dead easy and not the cutting edge of modern medicine, isn't really up there.
Equally iron infusions used to absolutely never happen. We knew they existed but they were basically mythical. Then a new product came on the market with minimal risk compared to the old one and iron infusions are happening left right and centre. But this has only happened in about the last 5 years so there are probably loads of doctors out there saying iron infusions are rare, nobody qualifies as until v recently this was true.
I literally only found out about the new recommendations for alternate day iron from a Radio 4 programme when I happened to have it on in the car. Went away, looked it up and my mind was blown.