I'd encourage you to read the F1 paper and the Spanner paper if you haven't already. The big thing that stood out to me is that Google started that way (with Bi

I'd encourage you to read the F1 paper and the Spanner paper if you haven't already. The big thing that stood out to me is that Google started that way (with BigTable) where you'd roll your own availability and transactions. It didn't go well. That's the motivation behind both Spanner and F1: take the experience of how painful it is to do transactions on a Regional or Global level, and never make individual teams do it again. I see it a bit like "Don't roll your own crypto". Clearly some people are exempted from it, but you better be able to tell me why you get an exception. Disclosure: I work on Google Cloud and want you to pay for Spanner :).