The phrase "Why not both?" originated from a TV commercial for Old El Paso taco kits where a child model ended a debate about hard-shell versus soft- shell tacos by suggesting to have both options. The phrase has since become a popular reaction image and catchphrase used humorously to respond to situations where a choice must be made between two options, advocating for embracing both alternatives instead of choosing one.
This phrase is often used to highlight the idea that sometimes, one does not have to limit oneself to a single option—both can be enjoyed or accepted. It reflects a lighter, more playful approach to decision-making, encouraging openness to multiple possibilities, rather than picking just one.
In short, the reason behind "why not both" is a cultural meme that challenges the notion of limiting decisions to an either-or scenario, suggesting that often both options can coexist or be selected. It is extensively used in popular culture to humorously suggest inclusivity or plurality instead of exclusivity.