My impression was that their update cadence is ~never and that the Jelly Max is rather closer to iPhone-SE-sized. The last one I handled was for ephemeral use on a trip abroad. It was durable, functional, and it worked wonders as far as breaking the phone-checking dopamine cycle.
I'd never come anywhere close to trusting it with anything important, but then again maybe that's not such a bad relationship to have to a smartphone...