Your contentment with the imperfections of an unchangeable status quo is an inspiration to us all, but not everyone is so zen - as of this writing, 2075 HN users think it's "broke" enough to type their account details into a rando third part site. Email notifications - that you can turn off - are an obvious and utterly standard feature of all forum software since approximately ever. It's no wonder people miss it.
Is there a word for this? Defending obvious shortcomings as features because they are not fixable? It seems pretty endemic in hackerdom.