caranthir: I think, with the tiger mouth, bot (and many humans) likes Black's slightly better eyeshape. (Hane at T2 is more of an endgame aspect.) E. g. if White had a stone or position somewhere on the right side, with future attacking prospects against B group, then the tiger would be even better, but it's interesting that bot prefers it even on an empty board. I wouldn't be so sure if tiger really should be disallowed, but it's ok for me either way.
Tristram: on a generic board, AI slightly prefers making the second-line tiger mouth as the follow-up, and tenuki is also totally fine, so I think that the problem should end after the first move.
d4rkm4tter: Tiger mouth at S5? It is locally not good, because you might lose the hane at T2.
Tiger mouth at S5? It is locally not good, because you might lose the hane at T2.