While cash back is the most straightforward reward, the primary downside in 2026 is its lower potential "ceiling" value compared to travel points. Cash back typically has a fixed value of 1 cent per 1% earned, whereas travel points (like those from Chase, Amex, or airlines) can often be "transferred" to partners to achieve values of 2 to 4 cents per point on business-class flights or luxury hotels. Additionally, cash-back cards often come with lower sign-up bonuses and fewer "lifestyle perks" like airport lounge access or travel insurance. Another significant downside in 2026 is the "redemption friction" introduced by some banks; for instance, some cards now require you to wait until you reach a $25 or $50 threshold before you can cash out, or they may cap your monthly earnings in high-reward categories (like 5% on groceries). For heavy travelers, the "opportunity cost" of earning 2% cash instead of 2x transferable miles can mean the difference between a free international flight and a mere $200 statement credit.