The spring makes the pedal "automatically" return to the heel position. If that makes sense for you, depends on your work-flow and application.
It doesn't make sense for a normal volume pedal to return to zero volume by itself. But if you use the volume pedal to boost the signal (Pedal Range>0), it could make sense to temporarily boost the signal and then automatically return to nomal level.
It can make sense for wah effects especially in combination with Pedal Mode "Bypass@Heel". But it means, that you could never leave the pedal alone in a middle position to shape your tone constantly leveraging a wah effect. But do you need that?
Same with pedal pitch effects or Morphing. The pedal will allways return to base pitch or base sound by itself. Is that what you need or do you intend to leave the pedal alone in any other position?
If you intend to link pedal functions e. g. "WahPedal to Volume" consider the dependencies as it might work for your wah application, but not for volume.
I use such a pedal as a dedicated wah pedal in combination with Pedal Mode "Bypass@Heel". That works well for me.