@elkie-t - I will bring a VFFS simulation by Alexandra. But the critical part is to somehow show that this is really needed and not just to make me feel a bit better.
@Complete - First of all, ageing is a condition that affects everyone, while being born trans is something that affects very few. To be a bit over the top, I could also say why should a person who cannot walk properly get a prothesis or walking aids - she can as well just hobble her way to the next store to get food. I know, most likely you are from the USA or some other brutal country that basically puts everyone in charge of their own well-being and does provide little in terms of social security and healthcare. But consider two things for a moment: I pay roughly 50% of my income in taxes and social insurance. I pay about 800 EU a month in health insurance. All of this is mandatory and I cannot just say I keep that money for FFS. If I would pay a tax rate that is similar to the one in the US, I probably would be able to pay for FFS just from the money I would save from the taxes within a few years.
I think it is legitimate that in such a situation, at least a tax cut for the expenses of a surgery that has a medical background (again, if I was born cis, I would not need such a surgery) would be fair. I am not asking for anyone to give me tax cuts for getting Botox or Lip fillers or a facelift, but for a surgery that removes what testosterone did to my face in puberty. It may not be as severe as with some people who basically have no chance to "pass" without FFS, but it still is the same reason.