Stone me, but I still love Season 2 the most. That being said, I don't really have a problem with the pacing to be honest; Season 4 has been a definite improvement upon Season 3 for me, even with the abrupt departure of Mary Wiseman for an Academy series that has a permanent rented space in mañana-land next to Section 31. Yeah, not gonna lie, her absence robbed the series of the kind of comic relief Wiseman was seemingly effortlessly able to provide (not to mention Tilly's magnetic personality) and left a hole that no character seems to be able to fill. Maybe Tig Notaro could come close with her different brand of humor, but she's only available for one, maybe two days a year, tops. The apparent replacement doesn't really have any personality other than "cringe," and while cringe comedy can be executed well (as has arguably been demonstrated by Wiseman herself in the past years or by Doug Jones whenever T'Rina enters Saru's field of view), they don't seem to be able to get it right with Adira.
I mostly liked the episode, even with the junk science that I don't really care much for anyway. I've seen worse things in Star Trek than an EV suit letting through something that should be big enough to be blocked by a 21st century hazmat suit. The episode was exciting, the aliens really interesting and truly alien, at least as far as Star Trek goes, so I certainly won't go around popping veins about how this or that doesn't make scientific sense. But to offer an alternative way the writers could've done this, at first I was wondering if Keyla was unaffected by the hallucinations because the (then) unknown phenomenon affected a part of the brain that was replaced with cybernetics in her. We never learned how extensive her cranial damage was as far as I remember, so there might be some replacement parts inside.
Overall I really enjoyed the planetside exploration, because the whole premise brought back vivid memories of the countless hours I've spent playing Stellaris. I can absolutely see this episode as an explorable Planetary Anomaly or an Archeological Site; the game already has precursor civilizations both extinct and alive but reduced to shadows of their former glory, ruined or even broken worlds including former gas giant cores, Niven Rings (to use the common term for what the writers erroneously called a Dyson Ring)... even the DMA could be implemented as a quite challenging Endgame Crisis. Looks like my habit of always naming my first explorer Michael Burnham and my first science vessel Discovery is finally paying off. Let's just hope that the 10-C don't turn out to be Fanatic Purifiers who see all life other than their own as abominations to be purged or a Militant Isolationist Fallen Empire that can awaken if poked hard enough and reform into Jingoistic Reclaimers who steamroll through the galaxy.
Another pleasant surprise is that as much of an asshole Tarka is, I can't really see him and Book as truly antagonistic. In the dramatic sense, they are, because their actions are at odds with that of Discovery, but at the same time, their motives are sympathetic and I don't feel any malice from them, to the point where I often find myself rooting for them during their scenes. Their uneasy alliance is one of the best part of this season for me along with President Rillak and of course Saru's relationship with T'Rina. Ndoye, however, feels like she's being contrarian for the sake of being contrarian and no matter what Burnham, Rillak or T'Rina suggest, she can be relied on to oppose it, which is becoming really boring.