More evolved meaning what? TNG had racism, sexism, snobbery and elitism. What more evolved do we want here?
The Vulcans made Kirk & Spock fight to the death in "Amok Time." Talosians imprisoned various races with the idea of using them as slaves to reppopulate the planet. Kirk wanted to let the Klingons die in "Undiscovered Country." A huge swath of Federation "leadership" plotted to assassinate the President of the Federation to prevent peace from breaking out. The Crew turns on Spock in "Galileo Seven." How many times did Kirk, or Spock, or Data, or the TOS/TNG crew disobey orders or steal a ship, or stop some fascist Admiral or judge from a nefarious plot? I've lost count.
Aliens were frequently not very enlightened. You had ultra-powerful beings up to no good: "Charlie X", "The Squire of Gothos," "Who Mourns For Adonis?", and "Catspaw." Not to mention Klingons & Romulans.
We have a renowned federation doctor lobotimizing patients in "Dagger of the Mind." We have a Starfleet officer go homicidal when he gets ultra-powerful "Where No Man Has Gone Before." A mass murdering tyrant in "Conscience of the King." And those are just off the top of my head.
People pushing the nuTrek distopia/abondoning Gene's vision thing just need to stop. It is laughably inaccurate. On both counts. The future was never utopian and free of conflict, inside the Federation or not. And NuTrek has not abondoned Gene's optimistic take.
But there has to be conflict for good drama. It has come from various places:
1) Inside the character. Kirk in "The City on the Edge of Forever."
2) From an external threat. Romulans in "Balance of Terror." An alien superpowerful being in "Charlie X."
3) Within the Crew: External/Alien Forces. "Where No Man Has Gone Before." "The Enemy Within." "The Naked Time."
4) Within the Crew: Actual. "The Galileo Seven." "The Menagerie."
5) Within The Federation: Alien Influence. "Conspiracy."
6) Within the Federation: Actual. "The Undiscovered Country." "The Drumhead."
Both Roddenberry Trek and the NuTrek deal in all of the above. Albeit in different proportions.
The main diffetence is that in older Trek (mostly episodic) the threat gets wrapped at the end of the episode and everything resets. Whereas in NuTrek (most serial) there is a threat that looms over the whole season and does not get resolved until the end. So the whole season seems darker and doomier (though some of DS9 & ENT were this way).
And it is frequently a Federation/Galactic level crisis. Light/campy episodes are hard to do with the Sword of Damacles about to fall.
I will say I think NuTrek leans heavily into personal/internal conflict. But man, do they heap a tangled web of loss/trauma improbably inflicted by a small group on each other that they have to continually work with.
Especially Disco.