We don't pump our plants with chemical fertilizers, which would give us extra tons of fruit, but just that much less flavor in each berry. Organic methods help in this area because the organic fertilizers we use release nutrients to the plant slowly. We choose varieties which taste good. We build our soil. A rich soil will offer the plant a wide range of nutrients which will result in a more complex flavor.
Flavor is a combination of smells and sugars.
It is possible to grow a strawberry that is sweet but still lacks a complex flavor. Most strawberries are grown on sandy soils which don't have much to offer the plant in terms of nutrients. We don't water too much. The extra water dilutes the flavor. We don't give up.