Sorry, Apple: "Pros" need the ability to burn discs, add hard drives, expand RAM, and install new PCIe cards - internally. This little monolith of a Mac Pro ain't going to cut it. It's essentially a tall Mac mini with better chips and more ports - no thanks.
Quite apparent you've never used Thunderbolt. It's more than capable. The Mac Pro can drive triple displays in 4k resolutions (3840 pixels × 2160) via Thunderbolt. Optical media was dead half a decade ago, being extremely generous on that. I've got a 2009-ish iMac that's never had a disc in its optical drive. Ever. Never, ever.
No one dropping 4 large plus on a Mac Pro gives 2 craps about burning discs. It's there to edit video and audio to a central host/server and nothing more. It's not a consumer grade device, people will be editing HD and Ultra HD content on it and a optical drive to them is about as useful as a floppy drive.
Personally, the extruded/cored heatsink internal case design is quite neat, but nothing new. I had a massive old PC case (Zalman, iirc) years ago that the entire case was a heatsink, no fans required even on a highly overclocked machine. Thing was as heavy as a tank, but dead silent.
