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Regarding prisons – according to Lizard, the main issue with them is that well-placed prisons create an imbalance in resource distribution, favoring the red player (to the point where "if the blue player appears, they are immediately captured"), while the absence of prisons or poorly placed prisons favor the blue player.
I don't know how relevant this problem is; we need the players' opinions.
As for the advantages of prisons, they significantly increase the pace of the game; you don't have to travel to all the castles yourself, and there's also the spectacle – a complex move involving clearing a large area of the map through a chain of prisons looks very impressive.
Overall, my opinion is neutral, so a simple majority of votes from the participants will be sufficient.
Regarding Miriam, Beatrice, and Alamar, the situation is much more complex... the fact is that banning these heroes won't fix the hero imbalance in the tavern, so the conversation might continue with "what about Thazar," "what about Crag Hack," and "what about Grindan," etc. That is, somewhere we will have to stop, so it is important to develop a criterion – what distinguishes an overpowered hero from a hero who is just slightly stronger than the others.
In my opinion, the criterion for being overpowered should be the demoralizing effect of "damn it... the opponent has Jeremy, with a strength of 117." I have observed this many times in relation to already banned heroes (Logistics-Luna-Jeremy), and it was actually the reason for their ban.
Is there such an effect in relation to Miriam, Beatrice, and Alamar... I highly doubt it.
That is, my opinion on this is pessimistic, but I am willing to listen to the players' opinions on this issue, but only if more than 2/3 of the votes are in favor of banning them.