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I've heard sintered pads squeal a lot.
They are louder than resin pads, granted, but I have not had one squealing in my experiences, they're more likely to squeal in the wet, but die down once moisture got burn off the rotors.
I'm afraid I cannot comment on what the LBS said as it is not my place to do so, especially the fact I have no idea how it set up without looking at it.
As for everyone went disc brake mad, I think a lots of company simply doesn't realised it need to be carefully build for road bike, for instance when road disc appeared 10 years ago, they use normal brakes housing which made brakes like the Avid BB7s felt horribly spongy, now with decent compressionless housing like the Yokozuna Reaction, they felt massively sharper and bite better.
Cheers. Definitely feels like I need to fiddle a bit more to get a feel for what's possible.
I've heard sintered pads squeal a lot.
I took my bike to my LBS and they seemed to think this was the best it could get with mech discs.
I feel everyone went disc brake mad way too soon.