OK didn't know this subject was so fragile that you needed to call a Ford tech to prove a point. No I'm not condoning that AC sealer is the best stuff ever made. In fact I already knew that it could cause problems in systems but if used correctly which means in moderation then it can further the use of a otherwise unoperable system. I agree the best fix is always to fully repair or replace what is broken but you want to know something else not everybody that drives a car has the $500+ to 100% correctly fix an AC system. As a ASE certified parts tech I sell this stuff all summer long and know the limits, I share those limits with each customer that wants to listen, if not then I'm not the one to say NO, it's their car. In fact I like it when guys like you and others on this board come in, they usually know what they want and want to do the job right.
Like you said to each and his own, nobody's perfect and you can't please everyone.