That's not really how Dalish society works though.
Wearing blood writing to them is as natural and expected as wearing clothes is to us.
So you can go through life until adulthood without wearing clothes in Dalish society? THAT explains why you never see Dalish children....
Personally, I'd equivocate the tattoos to getting your high school diploma. You can, in fact, go through life without them, but it's an expected right of passage. I'm just surprised Bioware didn't give us the chance to forego that kind of character accessory. Disappointing, but so be it. There's probably going to be dialogue about the Dalish elf being Dalish at some point, and there needs to be some physical sign for characters to realize that they are not just a city elf. The tattoos are the best solution for that.
Doesn't make me any less disappointed. Pretty sure I'll live, though. Maybe. Possibly. There's a non-zero chance of it.