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I guess the issue is when you have a front end for multiple services, which is really what GraphQL is for.

Not exactly arguing against your point, but there are distributed SQL engines that can run against multiple data-sources... Presto comes to mind.

https://prestodb.io/

Not exactly "distributed" but even good ol' postgreSQL has foreign data wrappers.

https://wiki.postgresql.org/wiki/Foreign_data_wrappers

Or having multiple frontends, each with different API requirements. Yes, you can still write multiple SQL queries, but the “carefully written SQL views” are not that useful anymore.

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