One issue with those “groove templates” is that they inherently only give you a single fixed swing setting per template.
In my experience, the magic happens when you program a beat and then turn the swing knob while listening closely to find the swing amount that works best for that beat at that tempo. If you change the tempo, you might want to change amount as well and the other way round.
I think this is what Linn refers to when he says (emphasis added):
It seemed to me that they are a sort of a ‘swing for dummies’ that didn’t work so well because certain swing settings work at some tempos but not at others, and it won’t add the note articulations (per-note dynamics, etc.) of a well-played beat.