I don't keep wayback-machine versions of Clark web pages. So, number and sizes of pockets might be some areas of change. They're the designers and evolutionary experts on their own stuff, but I'd guess there's a need to keep simpler the stock of different under-insulation pad sets in stock. From Clark's not including model tags and serial numbers on their hammocks, you need to know dates of mfg, or be on record with Clark as an original purchaser, to be sure you are ordering the right ones. (I've written the model on the stuff sack of each of mine to distinguish them.
Maybe there were parts on the old Vertex from now-discontinued 8ft long models? Maybe it is longer than the Flex180 as part of product differentiation.
I'd also guess they learned some things from the Flex 180 experience.
There must also still be a shake-down period for the data sheets. The pad sets can't really be all at the (same-weights) they list.
Observations, not complaints. I'm in a Clark most nights.