I didn't say anything about light weight..
I'll happily take a 475lb (dry) 162 Yamaha 800 Mountain Max that don't blow belts/spark plugs, has a reliable track, strong bulkhead/a-arms, decent electrical components, and exceptional fit and finish. I want the engine to be bullet proof.. Should easily do 10,000 kms without a rebuild of any kind.
Problem is, people want 400lb sleds that run on a hope and a prayer for 3-4 years while it has warranty.. Then they sell it and get a new one. I understand you want to have the most fun possible, and a light sled helps.. I just can't stand bringing a new sled back to the dealer for issues that really should exist in a $20 000 snowmobile. You don't see this in any other industry.. So why is it acceptable in the snowmobile industry? Simply put, because we let it.