Should we ban the Griffin Conservatory and the Hive of Serpents?

My friend got disappointed with Heroes, believing that everything depends on luck. He is a candidate for chess master. He played against Captain, who got a lot of cons on his territory. Later, he played against me and lost because he sacrificed on 40*5 griffins. After that, he told me: if there were 20 griffins in a pack, I would take it.
I don't want to convince anyone – decide for yourselves. For example, I like to play in TE without native secondary units (there is such an option).
I am ready to offer the author of the topic to play, without capturing hives and cons.