This is basically madness

We've known this for decades, eg grom Effective Oracle By Design: http://www.amazon.co.uk/exec/obidos/ASIN/0072230657

"Here's something that you might find controversial : Database dependence (regardless of the database you are using, this does not apply just to Oracle) should be your goal, not something to avoid. You want to maximise the investment in your database. You want to develop the best software in the least amount of time against that database. The only way to do that is to fully exploit what the database has to offer. The truth is that, with the exception of trivial applications, achieving database independence is not only extremely hard, but is also extremely costly and consumes a huge amount of resources ... your application would not use SQL beyond simple "keyed reads" ... in short, you would end up writing your own database."

or if you prefer that sentiment from someone who does not work for Oracle, here is Jonathan Lewis, a long time performance expert

"An application that is database independent is automatically an application that will perform badly at high levels of concurrency or large data volumes. It may do the job adequately, but you may spend all your time and money struggling to push the software into meeting Service Level Agreements (SLAs) and the users' expectations ... Database developers put a lot of effort into making their technology efficient, and basically assume that if they design a good feature into their systems you will be prepared to pay a small performance penalty in one part of their code in order to win a big performance gain elsewhere. Database-independent code doesn't use features, it uses vanilla-flavored, lowest common denominator elements - so you pay every penalty, but never pick up the benefits."

More here

https://asktom.oracle.com/pls/apex/asktom.search?tag=database-independence-vs-database-dependence

But here's the hilarious thing... People justify database independence as:

1- "What it platform X ends up costing too much?"
2- "So we better make it independent of platform X"
3- Because of 2, they burn 10x the CPU to make their software work
4- "See? We were right! Platform X is too expensive"

Self-fulfilling prophecy.

And the other thing?

I hope those developers are not using Windows PCs... or a Mac... or Visual Studio... or Visual Studio code ... or etc etc etc.... because, you know, vendor lockin :-)