My opinion is that emacs/spacemacs is more optimized for day to day work, than for the out of box experience. Personally, I'm fine with that, and there are some great editors (like sublime) that work out of the box if you prefer that.

However, the people generally working with/on emacs are not looking for that, they are looking for an editor optimized for customisation. They have already gone through the experience of setting it up, so why would they spend most of their time making it easier out of the box?

There is a cost to everything, and so far most people on emacs side have decided to spend their time on improving it's power, not it's ease of use.