Should penance be done for achieving powers from God?

Penance is nothing but rigorous worship of God. Penance for boons and powers have always resulted in destruction at the end. Kumbhakarna asked for a long sleep as a boon after doing penance. When he awoke, he met with death in the hands of the Lord. But Muchikunda got the same boon without penance and when he awoke, he got salvation at the hands of the Lord. Materialistic problems are solved by God even by devotion and even if the devotee does not ask for boons. Tyagaraja was a devotee of the Lord and was never worried about the marriage of his daughter. Yet, it was performed in the best way by the grace of the Lord. Ravana asked for powers by penance and was finally destroyed by the Lord. Prahlada, a devotee never asked for powers from the Lord. But he showed the possession of all the supernatural powers since he could resist the various attempts that were made to kill him. He was protected by the Lord finally. Therefore, devotion without any aspiration is the best way by which boons and powers will be granted whenever necessary. Whether it is in ancient times or in the present time, the concept remains the same.