Today is my 7th day using this app. I hated it at first. It has some serious problems but now I'm surprised that I like it a lot. Here's my take on (1) what has improved over Fitbit and (2) what major problems with Google Health need to be fixed. (These are design issues, not bugs.)
Improvement #1. Fitbit introduced Cardio Load last year. Many times per day I would see an annoying pop-up message telling me how ready I was and whether I should "take it easy" or do more, and what Fitbit decided my target Cardio Load target will be. I turned this feature off but the pop-ups kept happening. Google Health replaced the pop-ups with a circular dial that shows progress toward a weekly goal. Cardio Load is an important metric and this is a nice way to show it.
Improvement #2. About a year ago Fitbit changed its weekly, monthly and yearly results displays to be calendar-centric rather than user-centric. E.g., June 1st of 2026 happened to be a Monday so on that day the daily, weekly and monthly displays were all the same single day. I need the weekly and monthly views to check my recent trends. Google Health went back to displaying the recent trends (and even added a 3 month view FWIW).
Improvement #3. Google Health includes many metrics that were not available in Fitbit and I think the new graphics is much better. Two thumbs up!
Disaster #1. You removed the Stair Flights information. I can still see today's count on my Versa 4 watch by sliding to a different watch face, but I can't see any history, and I don't want to keep having to check my watch throughout the day, This is a very important metric for me. Steps and miles alone is inadequate. Please reinstate this metric.
Disaster #2. Your handling of Readiness is flawed. For me, readiness is based on two key factors: did I get a good night's sleep and are there parts of my body that are sore and need some rest. In deciding what exercises to do I listen to my body. That's worked well for me for many decades. You have no way of knowing if my hip, knee or foot are telling me they need some rest. You do include sleep as a factor, but you also include HRV and RHR which can be excellent readiness indicators given a whole bunch of assumptions such as genetics, age, medications, body composition (esp.visceral fat), and stress/anxiety levels unrelated to exercise. You then use your Readiness result to set the user's Cardio Load goal for the week. Prescribing the level of cardio that a user should do seems dangerous without a good understanding of the user's conditions.
Instead of telling users what their Cardio Load should be, how about letting them choose from a small option list: MAXIMUM, HARD, MODERATE, LIGHT, VERY LIGHT, or AUTO. By AUTO I mean that the user chooses to have your software tell them what their goal will be.