Likely more of a tall seat frame with "enough" foam to do the job with a small fuel tank in the forward part. Most of these won't see a trail. At least until they are a few years old and a few people will convert them for trail use. The tall seat makes it easier to transition from standing to sitting and having something to put their rear end against going through the corners they can sit through.
On the durability front, I've been listening to a snocross podcast lately while driving down the road and it seems the sno-x tracks these days don't have the rhythm they used to. Built so that you have to just pound through things. Not having development going the last few years with the current trend in track design might have put the Catalyst SX sled behind a bit. Supposedly the previous Procross SX sleds were plenty durable though, so IDK. With the Catalyst being a consumer driven lightweight platform it's probably just a process of putting enough meat back on the bones in the right places.
