Also, one that was a licensed software that needed to support DB2, Oracle and MS-SQL to integrate with various state's agencies. The former was a huge pain, the latter was horrible to write code for.

For the most part, you use what works for you and stick with it. The more risky a platform, the less you rely on features like stored procedures, etc. In the end, I'd rather have vendor lock-in than have to write complex queries three times, and other really cumbersome abstractions, slowing things down a lot! Extrapolating to services beyond the DB.

In the end, the db migration was far less time/effort than maintaining an untethered software.