I can tell you that in a nutshell and why more and more people are demanding it: To avoid something like this:
Look at the boost and then the download numbers: 249 boosts and 6 prints. I’m not talking about charity, I’m talking about fake post exploiting the system. Maybe you haven’t noticed this yet, but now you can read through the topic and why the voices are getting louder to link boost and print to stop scammers.
If there was an obligation to print in order to be able to boost, scammers wouldn’t be dragging children in front of the camera. That’s the whole fundamental problem. Not the discussion about whether something is “complex”, that’s the real problem.