I read from some where else that Band 2 only counts steps when you walk more than about 10 steps at a time. I tried in at home, it appears every time I walked 12 steps or more, every single step is counted; if I walk less than that number, it is not counted. It is pretty consistent.
I guess this is Microsoft's philosophy of tracking exercise. A few steps of walking at a time does not bring meaningful contribution to one's fitness, so Band 2, as a fitness tracker, does not count it.
If this is true, I think it makes sense to me. I am OK with this philosophy.
Again, if this is true, it reflects again the historical problem of Microsoft that it often has good features and thorough planning in a product, but lack of communication/explanation causes huge misunderstanding.
On the other hand, Apple does it very well, sometimes too well, a tiny feature got blown up as revolution.