Perhaps would be nice to be able to switch off haptic feedback somewhere in Curve settings when you open app and enter PIN.
Not sure if it was introduced recently or was always like that and depends on phone.
With my old phone I did not have haptic feedback. With new one (android 11) - there it is. All other apps where I have to enter PIN does not have haptic feedback.
Maybe its possible to customise haptic feedback per app somewhere in the android settings, I dont know.