Making sure that every function and every preference is documented would be a big help. If I am looking through the available keycommands to see which functions I can add keyboard short cuts to, I get very frustrated when I find a function and think, “oh what does that do?”, load up the manual, go to the index and … it isn’t there.
Cubase is big enough now to warrant a feature refence manual which is more like an old programmers reference manual. That is one that simply lists all the functions and all the options, the context in which they can be used and what they do. A document like this is often the quickest way for experienced users to learn.
Building that sort of document is also a good exercise for programmers as it can often highlight inconsistencies or processes that can be streamlined and streamlining is something that Cubase can do with more than anything. Cubase has - and no one can deny this - an amazing feature set but in many areas, that feature set isn’t very well joined up - but that’s another topic.