Where is the logic in that? It's like people want choice, yet when presented with a choice they want everything, oh I have to choose between offense or defense but I want both! Nothing restricts you from getting some STR and some VIT but asking for both on accessories is straight up OP. All the other accessories only have 1 attribute on them so why should tanks get 2? If you are comfortable with a set amount of HP and know that x amount of HP won't burden your healers then fill the rest with STR but that's the thing, it's a bit of trial and error to find what works best for you and quite honestly Tanks are pretty much the only job that gets the ability to actually have some flexibility with their attributes all other jobs are pretty much one attribute will rule them all.