First parts of scene graph, more Project Bar copy/paste, new examples & more.
Good, that there are tests to keep base building block at good health.
Considering usability, I don't think there is serious impact using them. There could be only high impact maintain them, while still developing them.
Same with functions, you could do without them, but at some point switch to them for better usability.
Choosing advance is always bad, you start with base object and start to replace and switch them in case you need more and different features. When user has used object even once, he already knows how he can use it later. Basic use-learn is everywhere around us.
Sprite categories like: apparance, web, collision, animation, scene-view could indeed be, if possible, modules to be added by click? Or remove them. Something similar was added to scripting etc, to save memory.