What is the meaning of the number in the upper-right corner of the Watchtower screen?

I like the idea of a simple metric to get an overview of account security. But in its current form I really don't know what to do with this score. I can't compare it to anything else and even worse last time I compared the score of exactly the same account on iOS and macOS the score differed.
What really surprises me is the sharing feature. Isn't it a bad idea to share information about what kind of password manager you use in social media? It's an important piece of information that might be used in a targeted phishing attack.