This was probably intentional on the part of the Visio team, nothing to do with the VFP team nor some "campaign" you are imagining. You must understand that every effort in a product takes time to design, code, test, document, etc. It is obvious that the Visio team does not view their core customer base is not VFP developers, and I'm sure that is very true. In order to support old ODBC driver technology with security issues and such, it takes a fair amount of resources.
My guess is that the Visio team evaluated how much it would take to do this in a new version and all the issues and compared it to other features they wanted to add, and chose they wanted to do things for the mass customer base than a small group. It is a justified business decision for the Visio group to make, and it does not involve VFP or the VFP team. You may very well be the only customer the Visio team knows who wants this, and not many products put features in or spend resoures on them if there is only "one" customer asking for it. Just don't look at it at a FoxPro-specific view, it is a customer demand issue versus other things.