Maybe a mix of both would work best. Like right now in the EU they are considering making software updates mandatory for all devices for as long as the warranty

Maybe a mix of both would work best. Like right now in the EU they are considering making software updates mandatory for all devices for as long as the warranty exists (which is 2+ years for all electronics). Maybe do that, too, in the U.S., and then do something like "We guarantee warranty period +1/+2/+5 years of updates." Smartphones aren't even the devices with the longest lifecycle. Think about all of the "smart TVs" and "smart fridges" out there that people want to use for 10+ years, but they may never get a single update. Something definitely needs to do be about this regulatory wise, and it needs to happen soon before we're already surrounded by dozens of smart electronics everywhere we go, and not one of them had received a single updated after purchase.