That is an interesting topic! I know for goldfish and other fish this is a good recommendation re sinking foods. It would be interesting to see people's experience with this. There have been threads where this has been a solid solution.
For myself I have used pellets with certain fish but it has been mainly flakes. I would have to say I can't think of any times when gulping flakes at surface has been an issue that I can pick. However the fish are all common types, food quality would of ranged from cheap stuff (early days at school) to better stuff now (although it may just be more expensive not better).