That they miss the point. All the points that are brought up against Discovery have been done in Star Trek before. Irrational hatred of an alien species? Kirk and Stiles did that before Burnham did. War plots? I didn't realize that DS9's Dominion War was just an "occasional" plot device, rather than an overarching, multi-season, arc. Poor decisions in war time, including genocide? Again, hello Kirk and wanting to allow the death of an entire species. Oh, maybe Burnham's speech would better if it had included more Shakespeare like Kirk or Picard.
Refusing to engage with GR's vision? In TOS, the vision was less socialist, and far less utopian than what would later be presented in TNG. We know of colonial governors who engaged in mass murder to save other colonists, essentially eugenics of selecting those who would live and who would die.
Speaking of living and dying, how positive is it when the pilot episode shows a grim view of being a starship captain debating on retiring because he is tired of that choice. the burden of command was too much. Same character ends up living in a fantasy world for the rest of his life. How idealistic.
While we are on the subject of dismal, let's be clear about something. Star Trek, for all its utopian platitudes ("There is no money in the 24th century.") has always had a dark side. The Borg are among the most popular enemies ever presented on screen, and yet there is never any effort to redeem them, negotiate towards a permanent peace, or find common ground. At the end of every episode with the Borg, ultimately, they must be destroyed. How positive.
Oh, but the fans are
all in love with the utopian, optimistic future of Star Trek, right? So much so, that I know of at least 3 fan film productions developed around darker, grittier tones, including a famous speech in a well lit room:
Burnham would have probably been better accepted if she was played by Tony Todd...
Not dark enough? What about Star Trek: Renegades, before it became just Renegades? That one looked very optimisti...
Oh...more Section 31, more war, more dystopian than utopian. But, that's not what the fans want even though its a fan production?
Maybe Pacific 201 will be more utopian?
He's smiling on the inside, I'm sure of it.
And that's just a brief slice of fan films, let alone the various fictions and RPGs that I have seen involving the collapse of the Federation, or war plots, or conspiracy theories. One merely need to stroll through the "Future of Star Trek" subforum here to hear that pitch for a new Star Trek series.
The article demonstrates a lack of self-awareness regarding the history of Star Trek, TOS in particular, and what fandom has also presented as being of interest and presumes to talk for an entire fan base rather than acknowledge that things have not always been optimistic or utopian in its presentation.