I was similarly disappointed in the Trek documentation received with my Allant+ 7s — specifically re: fork adjustments. I have 3 Trek ebikes - 1 from Trek store, 2 from dealer.
My brother works at the Waterloo plant and is in charge of all documentation for all Trek bikes, leading me to have several conversations with him re: this subject. The current company line is to not provide documentation for non-Trek components, although that position is arguable re: Bosch, etc. components.
From these discussions, and from similar concerns from other Trek customers, my bro informs me that Trek is going through a significant internal ramp-up of technical knowledge across the board — with more expansive attention to ebikes.
The Trek tech support line is still the best, but although the Trek store personnel are terrific people, I find my local dealer to have a much better depth and breadth of knowledge from their exposure to a wider selection of ebikes. As a final note: my dealer (multiple large stores) is realigning their selection of bikes to carry Bosch-only given their experience of much higher levels of reliability and durability vs. other motor brands.