I so miss the days of the well structured and comprehensive manual. I used to read them end to end. Even if you didn't remember the details you knew what was possible.
>Touch and hold the Space bar with one finger until the keyboard turns light gray.
>Move the insertion point by dragging around the keyboard.
So the problem is more that OP doesn't read manuals rather than them not being as good as they once were.
At some point you just have to admit that there is realistically nothing more that can be done. Users don't want to read the manual because they can use their phone perfectly fine without it. They might not notice there is a nicer way to move the cursor but it doesn't really matter.
There is a manual and it comes preinstalled as an app out of only around 10 apps on the default screen and yet people still complain about the lack of a manual. I really don't know what they could do other than locking the phone until the user completes a quiz on the manual content.
What I really miss is having the time free to peruse a manual like that.