Android 17’s significant power increase in Dragon Ball Super is primarily attributed to his constant training and engagement in battles against threats on Monster Island. His dedicated role as a park ranger allowed him to hone his combat skills and endurance over a decade, facing various powerful creatures and invaders. This continuous self-improvement is a key factor in his transformation from a powerful, but ultimately limited, Android into a force capable of contending with Super Saiyan Blue-level opponents.
The benefit of Android 17’s increased power is evident in his crucial role during the Tournament of Power. His enhanced abilities allowed him to effectively combat numerous powerful opponents, contributing significantly to Universe 7’s survival. Previously, Android 17 was considered a notable threat to the Z Fighters but not on the level of cosmic entities. His growth demonstrates the potential for even seemingly stagnant characters to evolve into formidable assets. This development also adds narrative depth to the series, showcasing the importance of constant training and self-improvement even for those with inherent advantages.