Okay, so here's my thoughts on the new episode of Discovery, Whistlespeak.
This is a pretty good representation of the kind of episode that I was hoping this season would have. It touched on what different cultures believe about death, and it touched on the idea that a culture might develop a religion around far more advanced societies that were now apparently long gone.
In this episode, we're introduced to a prewarp culture that survived only because the Denobulans had left some weather control machinery behind that made the planet hospitable. In the centuries since the Burn, they'd managed to get inside one of these facilities and basically build a religion around it. This had only gotten stronger since the other similar towers had long since stopped working.
This is the kind of thing that makes a lot of intuitive sense. Of course if you leave a bunch of technology around near a culture that doesn't have the technical expertise to know what it is or even the theoretical capacity to make an educated guess, they'd make a religion out of it. And of course if you put a culture through a period of crisis, they're going to be drawn to certain supernatural or quasi-supernatural explanations for what they're going through.
Really, my contention here is that we haven't been shown this happening with the Progenitors. The entire galaxy had an existential crisis once the Burn happened. All the major powers apparently fell and even species that went unscathed don't seem to have quite had the same standard of living that they had before. And while the methods the Progenitors used to be progenitor-y might have been better understood by the 31st century, they'd probably still be in that region where it's basically indistinguishable from magic to a lot of people; especially if it's outside their specific field of study.
It isn't a question of whether or not a warp capable species will have religion or even theistic religions specifically. The Klingons and the Bajorans are both prominently deeply religious societies whose religions either actively involve deities or have in the past (the Klingons killed theirs). It's only a question of scale. A 31st century Progenitor cult wouldn't need to be widespread; it'd just need to be there, and this season would be a good time to showcase them.
The other thing I found interesting about this episode was that it was an interesting edge case of the Prime Directive. In terms of its premise, it really was the TOS episodes where they'd find some planet where some previous mission had made some major impact on the local culture in some way and the crew had to repair the damage, except taken to the nth degree. Instead of the cultural impact being something that happened in the last few years, it'd happened centuries previously.
This is the kind of edge case that I think Discovery really could have done well over the last few seasons. It'd make sense if there were dozens of cultures like this around the galaxy that nobody really knew about because of how hard getting from place to place was during the Burn.
Overall, I did like this episode. It just drew attention to a specific issue I have with this season. As a standalone episode it was fine, though.