I definitely agree with Thomas Yazbeck. As I mentioned in my response to best documentaries, the best new documentaries out there aren't on broadcast TV or cable; they are on YouTube channels. Or the slightly larger scale efforts of Curiosity
Studios.
This isn't the go-go 1990s or the pre-2008 Oughts. Studios are not (generally) pouring the money into paleontology documentaries--indeed, almost any documentary--that they used to. (I know of ONE big budget dinosaur documentary in early stages of pre-production,
but this isn't like the world before Planet Dinosaur and Dinosaur Revolution).
And that's fine. If the goal of documentaries is scientific outreach, then broadcast & cable TV are not the services that are going to reach as big an audience (and DEFINITELY not as young an audience) as various streaming opportunities.