Agreed. I managed the first two stages of the Colosseum. Then I died there repeatedly so I got tired and went to explore other parts of the game. I am replaying the game now on steam (I previously completed the first ending on Switch), and so I may decide to try again. But I'm just not that bothered. The pantheon seems interesting to me but not enough to really go there and die repeatedly doing it. Maybe one or two of the boss fights I would play again but I don't view most of them as extremely enjoyable so probably not.