I have some experience in happinesstracking as we do that for years in our company and I provide a similar web service for others. Some takeaways are:
- almost nobody wants to track every day
- many people want to track by events (something very good or very bad happened)
- it's more valuable, if you track a complete team or company and share the insight
- just ask for one metric, make all others optional
All the best for you guys, I love all the other people & services that do mood/happiness/satisfaction tracking/metrics.
I definitely agree with all your takeaways!