The problem with screens like that is they are very rarely used, and a screen full of giant boxes and options is quite intimidating. Nobody wlll use it.
Whereas a Just In Time box that explains what to do as you type, teaches people just what they need, at the exact time they need it – without resorting to a complicated, overwhelming screen full of options that people have to find and process. Lots of thinking and effort involved.
I agree they are not mutually exclusive, you can have both, but it’s quite clear if you do anything with UX that a screen full of checkboxes and textboxes and forms to fill out and text to read … is a really painful way to go. We won’t be building that first. Sorry. Priorities..