Health makes App useless
The App teaches largely by trial and error. Get it wrong the first time, learn something, then get it right the second time. This is incompatible with the health system, resulting in lessons frequently failing before completion. My pace is slowing to one lesson per day. Given the way Mandarin is being taught, essentially backwards, there are a lot more trials and errors, which would be ok except loss of health STOPS me from progressing. I loved DL for the pre-health French course but now I hate DL.
Unlike for French, hints are still available in Chinese even when there are word boxes.
Obviously Health makes things harder, but not impossible. Do new lessons on the web if you feel like. For a language like Chinese, the vast majority of your time will be spent reviewing, anyway.