‘…From what I heard, icetech rotors and finned pads are the solution to shimano using mineral oil as opposed to high-temperature brake fluid…’
This is pretty much cobblers.
Its true that perfectly water free DOT has a very high boiling point compared to mineral oil, but it stays perfectly water free for not very long at all because its hygroscopic, and this reduces its boiling point markedly, such that theres little difference between DOT and mineral oil in the real world.
Personally, I think Ice-tec is just something else to make sales. I’m sure that in big mountain country with massive plummets, floating metal sandwhich rotors and finned pads will make a difference, and only you can make a decision on whether its worth it or not.