I have a very hard time taking this point seriously, as long as you don't have especially small pockets you really shouldn't have a problem as I managed to fit a Note 2 into my pockets and that was wider and deeper.
Most of the time I wouldn't even notice it was in my pocket, it's only if you stretch so it gets put under pressure (big strides up stairs etc) where it was uncomfortable. I am not arguing this is the optimal way to use these phones, I didn't like putting it in my pocket and they're not especially pocket friendly but that's one of the ways people will use them.
The point I'm trying to drive home is assuming the units having problems didn't slip through QC then it's simply down to bad design on Apple's part, they should be handle normal usage patterns.
I wouldn't have changed my plans regardless of this issue but I'd be worried about resale value if it's fragile as I consider one of the advantages/justification of the inflated iPhone prices to be their resale value.