Yes… org-mode is more than 20 years old… It is a price of flexibility: I have a strong feeling that one can adjust org-mode to any workflow. But I do not use even a third of the org specification. There are a lot of cool blog posts like “org mode quick start” or “org mode basics”, I would recommend to start from such posts, not from a documentation.
No, I have two different things:
I like that approach, because I use orgzly-reviwed on Android with a notifications. And because it is simpler to maintain knowledge base.