Hmmmm. I have a theory. (but I'm no expert...)
If you push your stock wheels out 5mm, you have altered the offset and are putting extra stress on the hubs.
However, when you buy wider wheels, you'll notice that the offset changes to account for the extra width.
As an example, with simplified math, let's say your stock offset is 50mm. You buy wheels 1" wider (25mm), and they have an offset of about 40mm, a difference of almost half of the change in your wheel width.
But, let's say you found a +1" width wheel with the same offset as stock. Of course it wouldn't fit, unless you used a spacer to basically give it the offset it should have, in this case a 10mm spacer.
I don't see why this would cause any problems with the hub, and the larger offset of the wheel might allow it to clear the caliper, even though the effective offset is right where it should be.