My iPhone 13 Pro Max doesn't feel outdated to me. The only "defect" that's a pain in the butt is that it has the Lightning port and not USB-C (iPhones 15 Pro, for example, "just work" with most USB-C peripherals you could throw at them, and that includes external 4k displays). I feel like I'm going to keep it well until it disintegrates on me or until I can't replace its battery (right now it's at 83% health and at "peak performance" after 3 years).