I'm still using my iphone 6s plus from 2015. Smartphones sufficiently plateaued for me a long time ago. It's a shame the rest of you fine folks find everything so inefficient ;-)

I'm guessing there's a generational aspect to this as well, and if the devices are the person's only compute device. The assumption on my part is that the younger users are the ones to upgrade quickly as it is upgrading their only compute device. For someone like me, I'll always prefer a desktop/laptop to use for the sheer usability aspect. I just hate the small screen and hunched over posture of using a phablet-like device. That's me and my opinion, and we all like different things.