Some years back merchants offered a discount for cash. Some of the savings from not paying the credit card company for the transaction was being given to the consumer. You would think people would like this. Unfortunately they hated it. Unfair! Unfair! The problem was solved by charging everybody the higher price.
Yes, it is easier to degrade the signal on the iPhone4 by bridging the gap. But if you don't, many expects and users agree, reception is stronger and you get a bigger battery to boot.
I don't see what is so hard about not bridging the gap or using a case. Nevertheless, if people refuse to do this the solution will be phone designs with a predegraded, and thus undetectable, drop in reception.