I personally cannot explain better than the gyro legend himself Jibb Smart on this blog post, and this comment someone gave me on r/GyroGaming

The new Gyro As Mouse mode is honestly peak gyro. “Precision zone” and the options to choose between ‘world space’, ‘local space’, ‘player space’ are soooo good. Among the thousands of others but most are not new.

(FIY all source games at sensitivity 3 always have 5454 dots per 360)