The adapter is actually $25.

I'm not in the market for a new MBP—nor will I be for quite a while—but the adapter/port situation pisses me off way more than it should. Moving to a new standard doesn't bother me; what does is that despite knowing that it will cause friction, Apple deliberately didn't include the one adapter that's necessary to interface with their older hardware. Paying upwards of $2,000 for a professional-grade laptop and not getting one cheap, simple adapter is incredibly insulting.

Someone over at /r/apple put it pretty well:

If you wanted to use your brand new $2000+ Macbook Pro to charge your brand new $700+ iPhone 7 on the go, or maybe wanted to restore it or just have wired syncing...you can't do it out of the box. After spending all that money, Apple expects you to purchase an additional adapter to simply connect two of its latest products. Despite the progression in generations, there seems to be a regression with simplicity. There's now an additional step and cost to simply plugging in your phone to your laptop