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Well, it means you can use a mysql database for quick and dirty development, then use pgsql for production
Well okay, bad phrasing. Consider it more the split between the hacked together prototype and an actual long-term project
I’ve built apps where customers deploy into their own environment and demand a specific database due to their ops team, support contracts, or other reason. The apps use no db specific functionality but we have to support multiple
hopefully in a few decades those in-house systems will containerize everything 
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I was so sad when I saw that diesel had decided to use raw sql for migrations. Swapping databases was something that I regularly did with Rails
