Using styles.( track | handle ) can't replace ( track | handle )Styles property

[moong23]

since trackStyles can be used to set different colors for multiple tracks using the code below,

trackStyles = {[{ backgroundColor: 'red' }, { backgroundColor: 'blue' }]}

can set only one color to styles.track (IDK the usage of styles.tracks but, styles.tracks are not even able to be seen if there is track sets)

So I think trackStyles or handleStyles should not be deprecated yet.
If now, want to know specific usage of styles.track or styles.handle