Hannes, we look up to you guys.
Please, put yourself in our shoes, it's 2019ish, plenty of software in the pipeline, and it is the only one, this is the main point = it is the only one with no video tutorials.
Imagine you buy production equipment and set up your factory. All machines have user manuals except one.
Wouldn't you be surprised today (December 2018) if you were asked to put the factory on hold, and start experimenting and discovering with trial and error without user manual how this machine works, while all other machines are readily usable.
It's about the factory, not the machine. The objective is not to learn Terragen, the objective is to make Visual Effects for our own films . We were told Terragen was good at what it does, but this machine is put on the side in the factory, collecting dust.
I only mentioned Houdini because it is the furthest from Terrains, and the most complicated. It's meant to be an extreme comparison. So we're saying we could use a completely unrelated machine (Houdini) to do that job, because the unrelated machine (Houdini) has extensive references while the dust-collecting-machine (Terragen) doesn't have any, and there is no indication it will ever have.
Again we look up to you guys but those times are long gone.
P.S. We're not a vfx studio that makes vfx for others, we're a film production company building an in house VFX.