Its not just the co-op adventures that need adjusting, but the less popular ones and since the loot update ones that used to be popular and are no longer.
To me it appears obvious that troops lost and time needed represent difficulty and should be rewarded as such. Then there are the co-op adventures which require good co-ordination from all the participants and should be more rewarding than adventures a single player can complete.
The lootspot issue could have been fixed long ago too, by giving loot to anyone invited without needing to kill a bandit, or require certain camps to be beaten by other players similar to the co-op design.
Since the introduction of premium time, lootspots are being sold at a higher price than the value of the loot for a player without premium. It would be great for the game if the devs were somehow able to fix these issues, instead we see a game that new players will find even harder than players did 2-3 years ago.