Not at all, they have large market share in cold places like Alaska where you really need the fire to stay going while you're away. Higher outputs mean lower burntimes but you need to understand that keeping a house warm is much different than heating it up. You're getting a pretty long burning cat stove so you will be able to experience this "keep it warm" shift in operation.
I have a non-cat in the shop and it is run at full output to warm up the shop when I plan to spend time out there. That is one reason for a non-cat in that building, there is no reason to idle the shop stove.
Oh I see now, I think. Was kind of confused because you mentioned a cat stove isn't as efficient at high heat output and I would think Alaska would be a prime location where that would be necessary. Wouldn't cold climates be better served with a secondary stove/hybrid?