It's to combine boxes. Bluray support sucks for PCs - have you USED any of the software they have?
So I could have a bluray player as well as a linux machine that (hopefully) would be able to act as a mythtv front end. I just negated the need for a separate blu-ray player/PC setup. That's less power draw, less cable mess, everything. It is just better.
I am not looking to be rolling super fast ninja sweet linux setup with afterthrusters here. As long as it could have played my HTPC recorded video (from the other TV), it would have been a perfect set-top box for me that combined multiple devices into one. But now it doesn't have that. And that's okay - Sony doesn't HAVE to make something that I want. But I also don't have to say that their current product is awesome when compared to what it was before, either.