I don’t think that there is every really a time when you would not want to have your feet in a neutral position. You can check on this easily enough with a couple of quick assessments.
Visual assessment: From a posterior view, if you can see if the big toe, then you have a foot that is pronating.
From a sagittal view, look for a fallen navicular and a flat medial arch
Movement assessment: Single leg squat test. Place the foot in neutral and watch for a valgus knee collapse.
*side note–if the knee collapse’s, yet the foot remains in neutral then the problem is likely in your hip
hope this helps,