You won't get any stones (or tomatoes) thrown at you by me...
I understand your point of view because I was initially disappointed by this new 5.1 surround mix, especially after hearing the new 5.1 surround mix of "Eye in the Sky" that same day.
I guess I was expecting to be blown away by Steven Wilson's mix in the same way I was blown away by his 5.1 surround mix of "Fragile" by Yes, and that just did not happen.
I understand why though.
As he pointed out in the liner notes, it's tough to mix a band like RUSH in surround sound, because not only were their records just designed for stereo back when they were recorded, but they were also designed to be played the same way when they played the songs live, so there's many times over the course of this record where the arrangements are very sparse, and that means the 5.1 surround mix is also pretty sparse.
The tom rolls moving from front to back (or back to front) annoyed me a little bit at first, but I've become more accustomed to it now.
Even though I have not done a detailed comparison of both 5.1 surround mixes side-by-side, I fully understand now each mixer's approach as well as each mix's pros and cons.
Steven Wilson fully acknowledged that the sparse arrangements were part of the sound of the album, and so instead of trying to fill out all channels to the max all the time, he focused on maintaining the original sound and spirit of the album, using the surround channels only when it was best.
This means that while his mix is ultimately a more front-centered mix, the clarity is incredible, and when the surround channels are used, it makes all the more sense!
Richard Chycki on the other hand decided to fill out all channels as much he could, using doubling and delays on guitar and vocal parts to try and widen out the sound. However, by doing this, I find his mix to be less focused, less discrete, and less clear.
All in all, I don't think there is as big of a difference between the new 5.1 surround mix and the old 5.1 surround mix as there is on an album like "Fragile" by Yes, where I think the new 5.1 surround mix is clearly the better mix by a long shot!
Steven Wilson's new 5.1 surround mix of "A Farewell to Kings" is the better 5.1 surround mix IMHO but it still pales in comparison to other recent 5.1 surround mixes of his like "Three Piece Suite" and (especially) "Black Sea".