And, for that matter, why does ST have to pander and specifically present large-busted women?

While I agree with your overall point, I think 7 of 9 was more than just a woman with big breasts. Her character was far more interesting than anything else on Voyager, or at least in the few episodes I watched. Actually it has long been my contention that Star Trek writers can’t seem to write “strong” women. 7 of 9 seems to be the only success, and the line of failures is long. Starting with Yar and Pulasky all the way down to (now Admiral) Janeway.