As touched on in
https://github.com/ppy/osu/issues/30237#issuecomment-2408557766, these
types of maneouvers are no longer required after
https://github.com/ppy/osu/pull/30021 - although as it turns out on
closer inspection, these things being there still *did not actually
break anything*, because the `slider.Path` mutation at the end of
`modifySlider()` causes `updateNestedPositions()` to be called
eventually anyway. So this is at mostly a code quality upgrade.
This is quite a breaking change, but I think it is beneficial due to the large amount of usage of this class.
I originally intended just to remove the allocations of the two delegates handling the `Changed` flow internally, but as nothing was really using the bindables for anything more than a general "point has changed" case, this felt like a better direction.