I think BGT requires ToB because it was from the start intended as the Baldur's Gate Trilogy (BG, SoA, and ToB--I know ToB is an expansion, but it does conclude the story)
The whole purpose behind BGT was to allow you to play from a 0 exp character all the way to the conclusion of ToB. With that goal in mind, it's much easier to code for SoA+ToB as a unit rather then first for SoA, and then try to add ToB support later.
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"Many are my names in many countries. Mithrandir among the Elves, Tharkun to the Dwarves; Olorin I was in my youth in the West that is forgotten, in the South Incanus, in the North Gandalf; to the East I go not"
--The Two Towers
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