Well i don't think it's useless , it's nice to have a visual indicator of the original value when you want to do some live tweaking with the fm amount or shape or Osc balance (using as an effect), then you can easily revert to your original value so you don't come out with a different sound after the knob twiddling.
I have this on an electribe R (Little percussion synth with some pattern editing) and i found this to be rather usefull.
Greetz...
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