Mysql is fast and easy to scale and make durable, what features of database do you really use that is not met by, fast, durable and scalable... Sounds more like perhaps some sort of belief rather than data?
That does not answer the question. Postgresql is faster than mysql, easier to scale than mysql, and is already durable without having to do anything to it. Saying "it is almost as good as postgresql" does not mean it has a use case.
Name one. Mysql is horribly broken.