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I would never use an iPhone if my phone were my primary computing device. But I just make occasional calls and texts, and use a handful of apps (for instance, Nextcloud and Home Assistant connected directly to my home server, bypassing most of Apple’s ecosystem).
For a secondary device, I just want something simple and sturdy that I have to think about as little as possible—and for that specific use case the limitations are a plus.
Jumping off the ISS wouldn’t cause you to de-orbit—it would just put you in a slightly more elliptical orbit that would eventually intersect the ISS again.
And if you did get into an orbit that took you down into the atmosphere, no parachute would save you—parachutes are for slowing to a safe landing speed from terminal velocity, not from orbital velocity. You’d need to go through atmosphere too thin to fill a chute, but still fast enough to burn you up.