TOS was full of episodes where ‘the other’ upset the utopian balance. While I love/prefer TOS, younger audiences tend to find the episodes unsatisfying, even twee.

Since TNG, conflict has come more and more from within Star Fleet/Federation rather than the monster/planet of the week.

My favorite episodes are the ones where there is some sci-fi problem, and they try to fix the issue. Or they have to mediate some problem with some aliens based on some pragmatic problem. They get presented with some moral dilemmas, and act in a moral way, and go somewhere else.

There’s no need to lie to romulans, bomb planets, etc.