Thank you, very interesting read! They do raise a few good points where MySQL outperforms PostgreSQL. I suppose that's one of the trade offs between them, data safety vs. performance.
really uber should not taken as an example, especially since they failed so hard with their databases in the past.
(I'm a Postgres fan, yes, but I think that there a valid reasons to migrate to MySQL (there are several other companies who use mysql, etc but Uber's stuff is just plain FUD))