I think you are a victim of hyperbole, foisted by those who have a economic interest in eliminating lead from brass. As stated by a recent editorial in one of the trade magazines, lead free brass is "brittle". One company started making lead free gas fittings and had to recalll them due to failures. His recommendation was to only use lead free brass where you had to, namely in potable water systems. I have never bought into the claim that lead could "continually" leach out of the brass without causing visible deterioration of the fitting, which seldom, if ever, happens.