There is a difference in scale - smartphones give access to a much wider array of content, even if you were to carry around a television and 20 newspapers.

There is also an important difference in kind - internet connected devices are bidirectional, which allows bad actors to implement addictive patterns that aren’t possible with one-directional media.

A big part of McLuhan’s idea of “the medium is the message” is that consuming the same content via two different mediums is not the same.