I am a newbie also, but I gather that you are correct. I fully anticipate making mistakes along the way, so having the ability to go back and fix them will be vital. My husband is a carpenter and he says wood glue bonds are often stronger than the wood itself (he did a project on this for a science fair in middle school or something). In other words if you try to break the glue bonds with force, you risk breaking the wood itself, instead. That kind of strength might be crucial in lifesize building or dollhouses made specifically for a pack of destructive 4 year olds, but for most I'm guessing tacky glue is sufficient in strength for our purposes. Especially green n00bs like us who have many hard lessons ahead of us.
From what I see of the Buttercup kit I just ordered, I am willing to bet wood-glued joints would probably be the strongest part of a Greenleaf build haha. I am going to start with white tacky glue. Reeeally hope I don't have to go back and unglue anything but we will see. I can only imagine this is why the included Greenleaf instructions suggest hotmelt or glue-gun glue; all it takes to remove the glue is heat and scraping. Still, sounds needlessly messy to me so tacky it is.
Good luck!
Ariel