Whenever I see stories like this I really have to wonder what these people expected to accomplish with these bastard step-children of Solaris. A few neat features to be sure. But it seemed to me that most Solaris folks had their head firmly planted in the sand when it came to the overall OS -- especially the kernel. "Look at the wonders of dtrace and ZFS" they would exclaim, completely ignoring the rotting foundation upon which it was built. These are just OS features. The core of the OS -- how well it scaled on modern hardware -- is utterly lacking.
I spent over a decade developing big data software, primarily on Solaris. I have seen workloads that bring a 64-core Solaris box to its knees with massively multi-threaded, big-memory footprint applications. Linux handled the same load with aplomb.
I get a sense from the email below that these truths are finally sinking into the author. I still sense a little denial in there, but he's moving on to acceptance.