2012 (agree it was a train wreck)
2013 Limiteds got short coolers and painted tunnels and rails cutting way down on snow and ice buildup.
2014 had 26 improvements over the 2013 scattered throughout the sled. Rode better than it's predecessors and truely was IMO what the 2012 should have been.
2016 got new suspension geometry front and rear, all new clutches, stronger chain case components, new skis, and a 3" track option. Rode better than its predecessors. This was as good of an overhaul as a XP to a XM IMO.
2017 Mountain Cat got revised driveshaft location and narrower running boards/belly pan, lighter tunnel. Yamaha turbo powerplant. Rumor is should have been new motor too, but changed piston vendors. Polaris would have hyped it, sent it, and dealt with the fallout.
2018 new motor, new primary clutch, new plastic, dropped a little weight. Between 2017 and 2018 change to Ascender was another XP to XM type update.
2019 Alpha rail and track option with 10" wheels to free up HP and new skis.
2021 equivalent of FOX IQS suspension setup available from the factory.
2022 Finally sealed up the intake!!! (haha) New lighter, narrower primary clutch.
Hardly any big tech videos explaining and touting how much better all these things were. Small video animation of the Alpha rail and Adapt clutch, but nothing that really would give you a grasp of by how much it was going to improve your riding experience. Oh, and this gem from 2013!
To say they don't have a marketing problem is silly. Many of the things you missed in your list proves that. I don't know if Cat doesn't like hyping their improvements because they think it also highlights the faults of older models, but they need to forget that and hire people that can spin that stuff over their competition. That old video of Rob and Dave there generated a lot of discussion regardless of how true or scientific it was. Even if the static weight is more, tout the riding weight and how balanced the sled is left to right... like this SnoWest graphic from the 2014s. Everyone would have sworn a Polaris was the lightest to tip, but the data showed it was heaviest one way. My new supercharger sled is perfectly balanced from one side to the other and it's pretty nice!
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Cat's dealer network and racer support needs improvement. Badly. No discussion there.
There also seems to be a huge problem with the bean counters holding back innovation. The 2012 prototypes were lightweight tube chassis rigs. The Alpha rail concept was on the snow in 2013. What Cat engineering and R&D cooked up in the past and has behind doors right now are good things. Cat and Textron have a problem not seeing the forest for the trees and need to get the stuff out on the snow and sell it! Some of us just get frustrated waiting sometimes.