Why are there almost no good tutorials on how to make nature illustration?
I only ever find tradional tutorials like Bob Ross that highly focus on technique and are useless to digital artists or digital art tutorials that don't really get in depth for how to draw details like plants, flowers, etc. and are almost always cliche pictures of snow capped mountains.

I feel like this is a really uncharted area in digital painting. Am I wrong?

I really want to learn how to draw everything in nature, like lakes, trees, waterfalls, sticks, flowers, ground plants, trees, shrubs, deserts, plateus, brooks etc.