Personally I find it useful to have both. The left one sets a curve you want for all profiles and then the right one can be used for an a/c specific curve where the default curve isn’t appropriate.
My POV hat switch needs a deadline otherwise the view drifts so the LH default curve fixes that across all profiles. I wouldn’t want to have to change this on each profile.
I tweak an axis curve that I use for collective using the RH setting as that is different for pretty much each helicopter.
I feel that they do distinct and necessary jobs.