Why do people not put radish on their tacos?

People might not put radish on their tacos primarily due to personal taste preferences, as the peppery flavor and crunchy texture of radishes can be polarizing. Additionally, traditional taco toppings like salsa, onions, and cilantro are more widely recognized and enjoyed. In some cultures, radishes are used as a garnish or side, but they aren't seen as a staple topping for tacos. Ultimately, it's a matter of individual choice and regional culinary customs.