Firebase is revolutionary. If you haven't used it, it means you can remove your reliance on all the server side logic you currently maintain. It is a huge philosophical change but is the perfect complement to serverless architectures. This is smart by Google. AWS AppSync provides much of the same functionality but gives you the benefit (if you already know Graphql) of Graphql. Or, it forces you to learn about graphql…
I use the analytics heavily though, the built in network reliability and performance analytics you get for 1 line have literally saved my company millions of dollars. Mentally it was hard to ditch direct GA but it’s really so great.