The issue is, specs often don't tell the whole story. Look at phones for example. The Pixel is still according to a lot of reviewers the best every day phone. You can find other phones with similar specs for half the price, but the hardware/software integration is what really makes a big difference.

I'm not saying the extra 600$ is worth it in this case, we'll have to wait for reviews to know that, but generally you're paying for better build quality, integration, support and form factor.