I think just in the sense that a directory called `/opt/redash` strongly hints by its name that it contains only a Redash installation, so that either other crucial infrastructure should not have been placed there, or it should have been called something that better reflected its contents.
I agree. I cannot understand why they mounted the MySQL data directories where they did. It just doesn’t make much sense. To me it’s like mounting it onto /boot and then being surprised when it goes badly.