The video is a bit superficial if you ask me; while PIC's S2 clearly suffered from plot pacing issues next to DSCO's S4 and SNW's S1, even Strange New Worlds is not exactly free from mental angst and personal tragedy (Pike now unhealthly obsessed with his impending hideous injury, Number One hiding her non-human ancestry, Dr. M'Benga marred by his terminally ill daughter, Uhura losing family in a shuttle crash, Spock forever losing his foster sister, and then we've got La'an with her own vault of demons, etc).
Because Star Trek isn't free of mental angst. There is this strange perception that Trek some how avoided mental health struggles, trauma and melodrama when, at least from my recent revisiting of Trek episodes, the opposite is true. The only difference is people actually being told it's OK to feel rather than just squash it, ignore, and move on, never to address it past the credits.
Every time I see the comments all I can think of is McCoy's speech to Kirk in "Balance of Terror":
[Kirk's quarters]
(Yeoman Rand walks in without knocking, to find the Captain lying on his bed.)
RAND: Can I get you something from the galley, sir? Coffee, at least?
KIRK: Thank you, Yeoman. Bring it to the Bridge. I'll be there in a moment.
RAND: Yes, sir.
(McCoy walks in unannounced, and Rand leaves.)
KIRK: I wish I were on a long sea voyage somewhere. Not too much deck tennis, no frantic dancing, and no responsibility. Why me? I look around that Bridge, and I see the men waiting for me to make the next move. And Bones, what if I'm wrong?
MCCOY: Captain, I
KIRK: No, I don't really expect an answer.
MCCOY: But I've got one. Something I seldom say to a customer, Jim. In this galaxy, there's a mathematical probability of three million Earth-type planets. And in all of the universe, three million million galaxies like this. And in all of that, and perhaps more, only one of each of us. Don't destroy the one named Kirk.