Amateur tomato grower here. One key difference between the flavorless tomatoes you typically find at the grocery and heirloom varieties is that the non-heirloom

Amateur tomato grower here. One key difference between the flavorless tomatoes you typically find at the grocery and heirloom varieties is that the non-heirloom tomatoes are genetically optimized for shipping durability while the heirloom varieties are optimized for flavor. I'm not saying you can't ship heirloom tomatoes, but they're definitely more prone to bruising, so this is likely an obstacle in shipping them over longer distances.