It's not just conventional wisdom, there have been genetic studies: https://www.science.org/doi/10.1126/science.1222218 https://www.science.org/doi/10.1126/scie

It's not just conventional wisdom, there have been genetic studies: https://www.science.org/doi/10.1126/science.1222218 https://www.science.org/doi/10.1126/science.1222218 A mutation of the SlGLK2 gene results in significantly less sugar in the fruit while slowing down ripening for transport.