The reason that I love immediate mode GUIs like nuklear and dearimgui is that, unlike callback based GUIs like nanogui, qt, gtk, wxwidgets etc, I do not need to learn how the framework Works internally in order to use it effectively.

The lack of callbacks in particular, means that I do not need to worry about memory management very much. Or, I should say, I don't have to defer memory management to later.

I own books on wxwidgets and on qt. To be honest, although I've read them fully, I still don't quite know how to use them well, nor how would I teach teammates how to even if I did.

Using a tool like dearimgui or nuklear, I have no books, but 95% of the time I can just copy example code from the demo into my app, modify it slightly for my needs, and call it a day.