He's complaining because the harmonics are covering up the fundamental. Although many of us like strings when they are new (I do), he will actually like strings better after a while, as he doesn't like the harmonics - he wants to hear the fundamental MORE. Which means dead strings/flats.if you ever get a 5 string you will feel the same about the low B string. Strings do sound different because they have different mass. And especially when they age the low strings go first.