Everyone who has played the first game even a couple of times knows about this simple fact. The same applies to the cave and so on. Everyone is on equal footing – dig what you think is necessary... I am for abolishing this rule. And the same applies to buying the same hero multiple times during a turn.

P.S. I believe that the rule (with the ban) should be kept – as it is an extra reason to engage in generating – which, in turn, does not reflect the player's skill, but only the availability of free time. In the worst case, create a separate tournament "to test such knowledge and details" – but not for all tournaments.