The clear superiority of forge time does not render other means of learning valueless, and these should not be denigrated. Properly used, forum discussions, reading books or magazines, listening to podcasts, watching videos, visiting museums, and sketching ideas can all contribute to making one a better smith, as the theoretical knowledge thus obtained both informs and is informed by the physical experience of actually molding hot metal with hammer and anvil.
The challenge -- the common pitfall -- lies in succumbing to the temptation to confuse broad theoretical knowledge with actual practical expertise, to forget that true skill is only earned through repetition, attention, and sweat.
Another good reason for the occasional smith to be able to rely on mechanical means for heavier work. Thank goodness for the treadle hammer!