Thanks for continuing to poke us for this feature 
In all seriousness though. I find the mapping feature built on to the texture node to be limiting. In Blender 2.79 we had independent procedural texture mapping nodes (box/sphere/triplanar, etc). This allowed tweaking the mapping easier.
What would be your preference?
I do my best 
It is a feature I find very useful (almost indispensable) for when you create concept art or background art etc and want a material to be textured onto a a group of objects with the same scalings etc for a "carved out of the material" look. Currently in Blender I have got used to the way EEVEE and Cycles handles this even if it might be sometwhat odd to have projection/sampling integrated into the image node. Preferably the Blender Image node would be supported so it would be easy to switch from EEVEE to RPR during design and lookdev without having to use two different materials. If there would exist a separate RPR projection node or so it would be a nice bonus feature I guess: so both please
In the lastest build there is a "RPR Projection Node" that has a trilinear setting. This doesn't work or at least not the way I am exepecting this kind of feature to work.
Here is an example: (Box mapping using world position in eevee)
A: world position
B: using texture for the mapping
C: higher value = larger texture = smaller internal UVW
😧 Box mapping and using the blend to get better results on curved surfaces
Sometimes it is very useful to be able to use the transformed objects.
E:Here I uses a vector transform from world to object space making sure to transform as points to have translation come along for the ride
F: the effect is that the scaled plane and rotated cube use their non-identity transforms and hence have different mapping
G: Using the scaling parameter set to "Texture" a high value results in a larger texture. this wors in the other way in RPR
Finally trying to achieve this in RPR:
It fails.
And when trying using RPR Projection to get something similar:
