My partner's iPhone is six years old. We're going to replace it soon because it stopped receiving security updates. She'd keep using it until it completely bricked otherwise.
I appreciate they're some of the best around for longevity but I wish they'd push further. I have a Fairphone and their firmware support is the same so it's frustrating that there's not really an alternative here.
I wish more devices would move in the Framework laptop direction, where hardware can be upgraded and old hardware can be repurposed.
All of these are individual actions. I'd add organizing with other folks trying to make a difference. Direct action or political advocacy can have a much more significant effect than an individual acting alone.