This is complex and here I don't care which database is in the middle as MS has no access to the data.

Let's think of an example.
Next week I like to go from Berlin to London.
So I choose a train (MS SQL) or a bus (DB2) or a plane (MySQL). No speed judging here....
For me, the journey is the thing I like to get done and
not the type of bus or the type of plane.

If you can build a similar system with a central database from any manufacturers, where you have all devs of Hive apps searching way faster for the content of the #Hive blockchain, please do this with the tools you love to use.

As you see, the service is what we all are looking for and not the different parts the service is built with.

I created many services for banks, insurance, and other businesses and we had this question many many times. The result depends always on your personal view, the costs, and the way you can manage the whole solution.

This said, I'm happy to support #HiveSQL as this saves so much time. I look forward to see your or other peoples HiveMySQL project and will support this as well....