You're not getting it, like you said before...
- There are amps in the Axe that don't even seem to catch the real one good enough (which seems kind of understandable to me), so how could you "simply" TM just any one amp at all? (I hope not, or real amps will die out *too* soon) I understand it's useful, unless you really *love* that amp, then you'll want to get closer and have it at least as a model, so you don't only get a big part of the sound in one setting.
- the sound is just a "small" part of the total experience. Ideally, you'd want "the full organic experience" modelled (sound, feel, fragile harmonics and all
)
- a TM preset from someone else was made with their specific PU's and playing style and will sound best on their guitar (or am I wrong there?) I've not yet had a kick from someone else's TM preset.