First of all, regarding Purgatory not making sense, it’s a holy mystery and we here on earth are never going to understand it perfectly.
Second of all, Purgatory is to be avoided, but not out of our fear of physical torment. (Which might not even happen in Purgatory anyway. )
It’s to be avoided out of love for God and trust in his mercy.
Even if Purgatory was a nice place, we still shouldn’t want to go there because it hurts God when we end up there, according to St Therese if Lisieux. We should instead try to avoid sin and, when we do sin, repent and confess and then rely on God’s love and mercy to spare us purgatory.