Now, that's just paranoid. Who ever said people want to make setup decisions exclusively based on iLv? Can you quote such a post?
Secondly, why add iLv requirement checkbox to Party Finder recruitment optios then? Yuo're being inconsistent. And paranoid.
Besides, as long as we can see other player's items, we can calculate their iLv easily, with or without a calculator.
Whatever you were afraid of by witholding this quality of life improvement, has already happened. Or not.