I think the real power of Keen is the ability to gather analytics for your clients. If you're a platform (think Shopify), your customers probably want some sort of dashboard and reporting on their customers.
Keen makes this too easy with their embeddable JS visualizations: https://keen.io/docs/data-visualization/ and scoped keys for security: https://keen.io/docs/security/#scoped-key
Also checkout this comparison of Mixpanel & Keen: https://keen.io/blog/67519816958/mixpanel-vs-keen-io-whats-t...