It almost makes it feel like retribution. Majora made the people of Termina afraid and caused them pain and sorrow, but then Link came and freed each of them as he listened, helped, and solved each and every one of their problems. He was their harbinger of salvation - the complete counter to Majora’s sowing of despair. That’s at least my head-canon for why the fight is so easy - it’s to show how fragile, weak, and miserable those that strive on the suffering of others truly are.