The documentation source for autosuggestions and autocompletions doesn’t have to be manpages, but really anything text-based.
A shell more like what Plan9 has, where you can simply click where you want to place your cursor would certainly make entering commands, fixing mistakes, and changing arguments much easier.
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It would certainly make that kind of thing much easier, for people who don’t do it much.
The tab-completion kind of thing discussed in the preceding series of comments, is mostly on the other end of the scale - typical “power user” wish list, I’d say.
Terminal, as it is and has been since BeOS, is a very powerful UI for people who can type reasonably well, and have some familiarity with the basics - the shell, the accessory utilities, and what Haiku has to offer there. It’s much faster and easier for me to sort through directories looking for something, for example, than if I had to use Tracker or anything with a graphic user interface. It’s faster, for me, to edit a command using the interactive shell’s editing features, than it would be to poke around in it with a mouse.
I also like to use the # trick, simple and elegant:)