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The ban exists and is borrowed from the rules that have been used in dozens of tournaments.
Therefore, in tournaments, those who play better win, not those who have more time to repeatedly save and load the game to catch up on weeks of growth and enemy heroes.
The ban on using a developed enemy hero is needed so that players play, and not their heroes. This again sharply limits the possibilities of saving and loading and puts in the first place not the availability of free time for the player, but his skill. The same applies to graveyards, caves, and so on.
If you think about it, the result is a kind of compromise between offline and online play.