With internet content instead of a magazine, I cannot read the material while riding on the commuter bus to and from work. With internet content instead of a magazine, I can't sit in my backyard and read material in the afternoon. With internet content instead of a magazine, I cannot have the magazine at the gaming table at my friend's house when he hosts a session. And so on. With internet content instead of a magazine, I cannot read through an article when I am not at my computer.
I suppose I could print out the internet content, and keep a physical copy, but that's a headache for me that would have been avoided i I simply got the paper version to begin with. Internet content is, in many ways, and for many people, simply a less convenient delivery system for the material.