Welcome, and you bring up some good points. But if you want to make feature requests, please use the template. And do one FR per thread. And search first.
For folder icons, that’s a good point. And it’s been discussed. Someone came up with a CSS workaround here: How to auto add icon to folders and notes? - #4 by holroy
I just tested it now, and it works. So I’m going to start using this! I’m now using it to add the folder icon, but not the note icon.
As for a folder “Liu Bei”, may I ask? Why a folder for something where there is only one note? I guess the simplest answer is that if it’s confusing, don’t structure it that way.
But, as for a feature request, making folders be able to be content is definitely an interesting idea, and something you can do in other apps, like Scrivener and Zim. But it is also a feature request that has been brought up here in the past. So make sure you search before making a new feature request.