I am also saying that continued day to day activity while never taking any damage that prevents (or strongly counterindicates) continued day to day actiity, was intentionally written into the 4e system's "smart play" because the good folks at WotC thought, although the result might quickly become absurd, it was "more fun".
Except that it's been written into every D&D system I'm aware of except 1E's optional rules for not dying when you hit zero hp.
The only difference in 4E is that banning clerics isn't sufficient to erase it from the system.