Just going to highlight this portion of my other post.
There's not going to be a rug pull. While I'd recommend moving to the new functions eventually, it's because they are better. There is absolutely no urgency to doing so.
I'll even state confidently:
The next major version of Ignition, 2027.2, is not going to do anything to change the behavior of system.db.runNamedQuery in a backwards-incompatible way.