Well said. The videos I have seen show that heavier strings cause an increase in bass which, perhaps, then overrides and squashes the highs from the other strings, resulting in more bass and less presence and treble and a more muffled sound. Of course, the more distortion you are running through, the less prominent it is going to be, but Rick's video was with a good amount of distortion, revealing that these characteristics do shine through. Which is why Rhett Shull realized that 10s (or 11s on one of his guitars?) weren't actually giving him better tone, they were muffling his tone by reducing presence and bite. So the question is... is this reduction in presence/treble and increase in bass something that you can EQ out (and back in) on the amp or not? If you can EQ it, then who cares? But maybe you cannot EQ it back in (or out) because it seems to be how the signal is hitting the preamp tubes. But I have no idea what I'm talking about. I'm just trying to draw logical conclusions/assumptions from the data I have observed in the video.