But they obviously try to keep things consistent. They made up a whole unique afterlife for Klingons on Voyager. All the complicated rules for honor killings and being disinherited comes from TNG and DS9. Hell, it's why they had to come up with a dumb reason for why there are "smooth Klingons".This is certainly relative; Trek has never been Dune.
Star Trek doesn't do "world-building;" the creators improvise whike trying to keep up and pick and choose from all the contradictory stuff that's been established in one story or another over the decades. Some productions employ people to research that, but it's then disregarded when that's desirable.
The fact that Jay-Den doesn't want to be a braindead murderer who dines on the blood of his enemies depends on everything Star Trek has done to build out the Klingon culture.
DS9 did the same for Ferengi and examining their patriarchal society (however problematically by making Quark a woman). Even Lower Decks built out the Pakled lore.
To say that there's no consistent world building in Star Trek and that none of that matters when even the modern writers feel the need to keep Vulcan stoicism canon (even if they made it genetic in SNW) kind of belies the material reality of Star Trek as a franchise.
