ORIGINAL: B.L.E.

The market for 2-strokes tends to worship horsepower and high rpm. Buying decisions are often based on brand X milking 0.1 more horsepower out of a .40 than brand Y does. Because of this, these engines are tuned for all out horsepower even at the expense of tractibility. Who cares about throttle linearity when you bore holes in the sky at full throttle for the entire flight anyway. Put a smaller carb on the engine for better throttle response and tune the porting for lower rpm use and nobody will buy it because it's an underpowered dog, unless it's built with bushing bearings and is sold for under $60 bucks retail, but since it has an air bleed carb so that it can meet that price point, it still does not transition all that well.

Four strokes, on the other hand, are designed to please a market of more experienced flyers who demand excellent throttle transition over maximum horsepower and RPM.

And thus, the stereotypes are reinforced.