The ballistic simulation which follows a scroll when using BouncingScrollPhysics gives good behaviour for a touchscreen, but causes much more scrolling than other desktop and trackpad apps. The amount of friction should be increased of the source of the scroll is a trackpad, to match expectations and behavior of other applications.

Reproduced using https://github.com/flutter/platform_tests/tree/master/scroll_overlay on Apple Silicon macOS. The same discrepancy is seen on iPadOS.