I don't think anyone disputes that TNG's cast was fairly homogeneous and light in the conflict department; I'm just saying that there was at least some
effort to individualize them, although a lot of the early potential for differentiation was squandered. But DS9 and VGR definitely tried to create casts that had more basis for conflict, people who came from a variety of different backgrounds. The various people on DS9 had all sorts of different reasons for being there, and a number of them didn't initially want
to be there at all. And VGR's crew was also designed to have a mix of backgrounds and goals to provide a similarly rich basis for conflict. In both cases, the creators were reacting to the relative homogeneity of the TNG crew and trying to build conflict potential into the series from the start. Although, again, VGR fell pretty far short of this aspiration because UPN insisted on downplaying the character conflict, preferring that the show be more like TNG.
So again, Knight Templar
, I don't buy the assertion that Star Trek
never had what you're asking for. Sometimes it didn't, but sometimes it did.