Why would Thor go through the trouble to create Stormbreaker despite knowing his hammer doesn't make him more powerful?

Spoilers for Avengers: Infinity War, in the scene where Thanos only has the Power Stone, and is fighting the Hulk, was he using the Power Stone to augment his strength or not?

Why did Thanos Love Gamora and Hated Nebula?

Thor's Stormbreaker

Why would Thor go through the trouble to create Stormbreaker despite knowing his hammer doesn't make him more powerful?
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​By Thaddues Howze

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Thanos vs. The Hulk

Spoilers for Avengers: Infinity War, in the scene where Thanos only has the Power Stone, and is fighting the Hulk, was he using the Power Stone to augment his strength or not?
​By Thaddues Howze

Why did Thanos Love Gamora and Hated Nebula?

But Nebula wasn’t. But I suspect it wasn’t her problem. She was being compared to Gamora and nothing compares to Gamora in Thanos’ eyes. She was his first daughter and nothing compares with the first born." By Thaddues Howze