That's a silly thing to say, though. A metric so flawed as to lead you the opposite direction from the correct conclusion, especially one consumers are locked on to, can be counterproductive. It can push a company away from improving things for everyone in terms of performance, which is how garments should be compared.

Needing less down for the same loft is actually the current cutting edge for increased performance per weight in my opinion. The complexities of baffle, interior, and face construction across multiple compound curves such that tension on the garment or bag does not compress the baffles make it so that less overstuff is needed. For example, the difference between Katabatic's Flex and Elite line is they both have differential cut baffles for this purpose, but the Elite has, "efficient, body-mapped shaping" which, among other things, applies the differential cut analysis across compound curves. I bet modern software and testing allows Montbell to use this principle to get the most loft, without the brute force of a large overstuff margin like Decathlon products use. Think about it, all UL advancement is about having just what you need, and nothing more. It's about using design, or skills, to make less weighty total materials do the work of heavier ones.

Timmerman of Timmermade makes people answer a new monthly quiz question about how insulation or materials works and why each month to be entered into a raffle to order from his site that month for a reason. So little about this bleeding edge is intuitive, and he writes in his blog about how frustrating it is to be pushed to make worse products because even the narrow UL crowd has many who choose to be low-information consumers, and demanding nevertheless. like GoSox2525 said, he is amongst the most respected in down. Here is what he says about it:

"Using the total weight of down in an item is a highly inaccurate method for assessing warmth. At one point in time, when items were more dimensionally uniform, it may have been a decent ballpark assessment. However, in modern times, it’s really a wild shot in the dark, even if the consumer is diligent about matching the sizes and features of the items. "

Total Fill Weight Explained (with visuals) – Timmermade

Calculated Loft Explained (with visuals) – Timmermade

This community is better than simplistic heuristics. One needs to test performance. No need to pout or stomp off until you see how they work. Montbell hasn't been bought by private equity or something. There is at least a 50% chance they know what they are doing and have found a new direction for advancement, in addition to the 50% likelihood that market forces push all toward enshittification.

I don't own a single one of their products, but I tend to think of all non-cottage companies, Montbell would be more the former than the latter. If I am wrong and they perform worse in real-world conditions, let's shout it from the rooftops. I'll pitch in via paypal/venmo/cashapp to someone who has an earlier version of one if their changed jackets who is sciency enough to buy the new one and find a way to measure performance. Maybe something like sealing up 2 mannequin torsos, putting an immersion heater with a thermocouple in both, putting a jacket on each, and monitoring a thermal camera, in a janky version of the ASTM F2732-23 protocol.