Absolutely, and from the perspective of breaking clays when pointed in the right place the Blues performed exactly the same as the Clevers, but the Clevers did so with smoother recoil and less resultant crud in the barrels.
I don't think I actually stated the Clevers were 'better' but in my opinion they are 'preferable' for the above reasons....at the end of the day shotgun cartridges are a consumable item and we all buy the ones that suit us best based on personal experience and preference.
But as for why leaving little residue isn't perceived as a strength, and given the clay breaking ability is identical, why shouldn't it be?