None of these devices contain a portal to the internet. None of them contain apps that bombard you with notifications to try and get you to spend hours in them. None of these devices have been relentlessly A/B tested to maximize addictiveness.
But out of the box all this shit is constantly begging you for your attention, they come with so many attention sinks installed that you have to find time and energy to sit down and curate, there's entire huge industries based on getting you to stare at your phone forever that you have to consciously spend time and effort to get rid of, versus "this ipod just plays music and cannot do anything else".