In reply to Justin.

Of course you don't. But, if the purpose of the Customizer is, as suggested above "show everyone how a 'theme options' panel is supposed to work," then the only way to know if it's working would be to carry out some A/B testing.

Otherwise, those using Theme Options pages can equally claim that their method is superior. And they have no interest in carrying out A/B testing either.

So it's assumptions all round.