The update included a specific fix for audio issues:
The Legend of Zelda: Breath of the Wild, released in 2017, was a groundbreaking game that offered an open-world experience unlike any other in the Zelda series. It presented players with an expansive, dynamic environment to explore, complete with a rich narrative, engaging characters, and innovative gameplay mechanics. zelda botw 160 update better
We aren't just talking about "smoothness." The 160 update usually accompanies high-resolution texture packs. The update included a specific fix for audio