pretty sure some people have done video essays on it, the TL;DR is it's due to politics, these shows aren't written by white moderate male conservatives like with TOS or neolibs who want a colorblind post capitalist utopia in space anymore like in TNG. its written by progressives who have a very different worldview
even DS9 was dystopian as fuck, but at least the writing was good, it's just not an actual star trek show, it's a "we're using the star trek IP to go to fucking war against Babylon five" show but you could argue it was the start down a slippery slope.
Janeway in Voyager is a war criminal crazy bitch, same as Sisko, shit even Picard in the movies is written completely different than Picard on TNG
RedletterMedia touches on it i think, or i saw it somewhere else idk.
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