Difference between using and not using slope bias is kinda appreciable.
Reference shot with a typical depth bias setting:
https://image.prntscr.com/image/swcSdHmuQh651Pf_E1PZkQ.png
Removing acne from unshadowed surfaces with slope bias without increasing depth bias:
https://image.prntscr.com/image/jswTkGSyT1WC9qLZ5GpUNQ.png
Removing acne from unshadowed surfaces using depth bias only for comparison:
https://image.prntscr.com/image/XaCE-jwQRhCPqTSh2o3Dlw.png
Notice how the small sphere starts peter-panning and its shadow becomes smaller than it should be on the last shot, and compare it with a slight distortion near contact point on a second shot.
This is pretty much brief gist of all the thread up to this point, and as a conclusion I’d add that being able to adjust both slope bias and depth bias separately for each cascade is desirable.