When I pulled the cable I saw the finger of the LitePro adapter lean against the seat tube. However, this might have been early on when the bolts securing the finger might have not been yet tightened up. I.e. you may have a point there, especially that if the finger flexed so much it might have been broken by now. Still the finger of LitePro looks a bit scary with relatively little material for the task. Mi.xim uses more material and you may need to switch to a longer holding bolt for derailleur, but that is not a big deal.

Thanks for the photo.