I truly miss how good the Weight tracker was, as I liked to view monthly vs. daily results for weight and body fat. The app has been a moving target over the past year, and a major disappointment.
The implementation ins Active Time and Steps, however, is quite good, and a good model for history. It shows 7 days, 31 days and 12 months, with an average line. This very chart with weight and body fat % would be perfect.
Same for Sleep, which gives you 7 days and 31 days. Add 12 months, and perfect.
As a general rule, consistency should be a guiding principal. It's as if these apps were created separately, then patched together on a single screen. Consistency in reporting would be a great step in bringing the app "together" and consistent.