To sum up the thread: with great power comes great responsibility 
This is a very important insight. I myself have many times struggled with how to do a thing in TW, only to realize later that I don’t actually need it to manage my notes, I just thought I did. This reminds me of the XY problem. A recent example thread, where the question of how to do a thing evolves into why even do a thing and what to do instead: Auto-appending a field - Discussion - Talk TW (tiddlywiki.org).
How to avoid this? A better presentation and focus on the not-too-overblown editions or examples for specific use-cases as discussed above would surely help.
My own three cents: I’m not a fan of directly using the heavily modified editions (like Memory Keeper, Stroll, or tzk), but I value them as an inspiration to develop my own, often similar approaches.
This is of course much more time consuming and many users will prefer to just grab a ready solution.
I think to make the general/beginner editions most useful, they should not be overloaded with features and ideally composed of removable plugins.