I think the nested tooltips are a fantastic solution enabling you to get into as much depth as you want without cluttering the UI. I like the advisors and tutorials; the only thing less than great about them is that you do lack a global (so not per-game) way of muting them once you've got your value out of them, as pixelcowboy says. 

User manuals were great. However, they can get outdated. They're expensive. They're not earth-friendly.  Once you're done reading and know a game - they wind up in my user manual closet.

But they were all we had.

Now - with advanced in AI - I think online useful tutorials and such will quickly be far better than user manuals ever were.

Whether a physical user manual or an online AI-based tutorial - it's only as useful as the information given.  Sometimes tutorials are written by the game wizards because they're the experts. However, being an expert doesn't always translate into being able to effectively communicate to non-experts.

I always had the expert write the manual/help file and then have a non-expert (me) read it and see where certain points could be better clarified.  

Agree when I was in the Army every once in awhile we would get a newbee who had no ability to retain what he was taught. 

That is why you will see me make long answers to question in this and as Ghost88 on discord and Steam. 

Found assuming someone knew something really could make an ass out of U and Me.