TOURNAMENT TROUBLES!

Luck is luck, but some logic is lost:D
And one of the game's tactics is also lost – intentionally attacking with a strong hero to weaken the enemy's troops, while incurring minimal losses (in the case where the enemy has War Chains).

I didn't understand the point at first, why you can't buy back your fallen hero, but in light of the explanation about War Chains, I agree that such a ban can be left in place. Although, it seems to me that in this case, the tactic of weakening doesn't disappear :) What disappears are the heroes who will go to weaken the enemy's troops that have War Chains :) But the tactic of deliberately killing your own hero against neutral creatures in order to buy him back in another fortress is somewhat lost (but this is a rare case, i.e., when you can't escape and you have to kill yourself against neutral creatures). But the game against the AI can become more difficult if it gets lucky with War Chains and it goes somewhere other than your main hero, which can also be considered a rare case. But if such a case happens, then such an AI can seriously interfere with the playthrough. That is, with such a ban, one can generally agree, with the understanding that you can encounter a case with War Chains on the map and it will be interesting to play.