My understanding of the keynote was that it can do some creative work pretty well. But isn't meant to be used as a primary machine that will be hammered with photos and videos. Also using the 8GB/256GB config for this is not very smart. It still performs well, because of the high swap. So that part of Apple's advertising stands true. It just does so at the expense of SSD lifespan, which Apple doesn't advertise. So yes, use a low end machine for heavy lifting, have it perform well but reduce its lifespan.
So Apple is either extremely confident of the quality of their new SSDs or the