Samsung z fold 3. Overall, I really like having a sizable screen on the go that doesn’t require me to carry it around in a separate bag. The big screen also makes split screen/multiple windows for apps actually pretty viable and I definitely don’t just use this to run 4 instances of pokemon go. The downsides are no custom roms for the phone, and basically every general complaint about Samsung people have made. Battery leaves room to be desired, but unless I’m really using the phone a lot, it gets through the day perfectly fine. A trivial bonus is that the 4:3 screen is perfect for wii/gamecube emulation on the go.

Like say telling to automakers they must include this design feature called seat belt and this another design feature called airbag

Exactly like that. It isn’t the government’s place to demand what features I want in my stuff.