I don't think the user would take kindly to obstructions to their browsing / app experience...

"Why does it take an extra unnecessary step to launch an app!? You're telling me this is for my own psychological good?!"

I suppose this goes to classical arguments about the role of government in banning drugs or mandating seat belts. The state doesn't think you are responsible enough, so they create an external structure (fines / criminal penalty) to make you do good for yourself.

Others would say that a sad restriction has been placed upon them because the rest of the population cannot regulate themselves to the satisfaction of the state. It can also be argued that now people rely on external pressure or structure to behave well rather than setting up their own internal structure.

Who said anything about mandating?

I know I periodically drop

    0.0.0.0 news.ycombinator.com
    0.0.0.0 reddit.com

in my /etc/hosts file.

I also added a "don't let me switch from this window until I ask to be able to switch from this window" setting in my WM.

It doesn't have to be imposed externally to be helpful.

The problem is, I often need to access that "stargate" in the course of doing actual work (looking up documentation, Googling error messages, etc.).