I and everyone I know who has used single-port MacBooks have expressed frustration with the need to swap cables or use the adapter, which among my family members has broken twice, and not for lack of proper use or storage.
I never really understood why it is better for the consumer to be either inconvenienced or out an extra $70 for an unattractive dongle. It's like if a wedding dowry was a facelift and a boob job, except the groom has to pay for it.