Enhancing Flavor: Sugar can enhance the overall flavor profile of the sauce. When used in moderation, it can bring out the natural sweetness of the tomatoes and other ingredients, providing depth to the dish.

Personal Preference: Taste is subjective. Many people enjoy a slightly sweeter sauce, especially if they grew up eating it that way. For some, adding sugar has become a comforting and familiar aspect of their cooking.

Pure Tomato Flavor: Critics of adding sugar argue that it masks the natural flavors of the tomatoes and other ingredients. A well-made sauce should celebrate the taste of ripe tomatoes, herbs, and spices without the need for added sweetness.

Health Concerns: With rising awareness of health issues related to sugar consumption, some cooks prefer to keep their sauces free from added sugars. They may opt for more natural ways to enhance flavor, such as using fresh herbs, garlic, or onion.
Culinary Tradition: In traditional Italian cooking, sugar is rarely, if ever, added to pasta sauce. Many chefs emphasize using high-quality, fresh ingredients to achieve the desired flavor without the need for sweeteners.

Whether or not to add sugar to spaghetti sauce ultimately comes down to personal preference. If you enjoy a hint of sweetness in your sauce, a small amount of sugar can enhance the flavor and balance acidity. However, if you prefer to let the natural flavors shine through, there are plenty of ways to create a delicious sauce without it. Experimentation is key—try both methods and see which one you prefer!