I feel sorry for your mate, Tomás.
My neighbors on one side always seem to use dryer sheets (I can tell from the aroma). Their dryer vents from their garage wall, directly towards the fence. On the other side of the fence is my enclosed patio with louvered low windows, which have an air gap (for ventilation I guess) top and bottom. In any case, I can always tell when they are drying laundry. That smell. Hate it.
Me, I stopped using fabric softener some years ago. For soft towels, I've found a mild liquid detergent is good enough. Although lately I've started adding an ounce or so of white distilled vinegar to the FS compartment. Seems to result in softer towels. And every once in a while, I'll use real grated natural soap (Mexican) and they feel even softer.
I didn't like the way FS encouraged mold to grow in the dispenser, a major reason for stopping its use.