In my opinion, I don't have any problem with intervention in babies due to traditions, be it tattoos, circumcision, piercing or other things.
I think people saying is cosmetic fail to see the taurine behind.
If there is scientific consensus that it's harmful, then by all means that practice need to be stopped, and I think this study is not conclusive, but it's a huge start.
But people saying they do it for "health reasons" are the biggest idiots of them all, because the only ones they are fooling are themselves.
In my culture, it's completely normal (and by normal I mean 100% of the people) to pierce girl baby ears at birth, and I honestly never even have it a thought, and if my daughters didn't turn allergic, I would honestly not even care, to me it's a good thing, not because of bullshit like health reasons, but because my ancestors who were good people did it, and I admire them and want to be like them.
To say I do it for styling or treat my baby like a doll is insulting to me, and is also insulting to speak about mutilation when speaking about circumcision (even though I personally think it is, and would never even think about it).
It's the same for other traditions, but say it's tradition and don't try to bullshit us by saying health reasons. And if you do it because you think it's cute or something, that's wrong too IMO.