I agree entirely. My aim was to draw attention to mindfulness mediation as a little-known but promising intervention, not as a standalone technique. So my use of the phrase "selective borrowing" was a lousy choice of words.
In my own practice I am very aware of the need to provide validation and other forms of support, even while teaching clients how to experience their spontaneous thoughts and feelings without being carried away or pushed around by them. And while this dual focus is especially important with highly reactive clients such as borderlines, it has its uses with a good many other patients as well.
So thanks for giving me the opportunity to correct myself.