Why? Because a good GUI is not thrown together in a vague attempt to be "first". A GUI requires pragmatism, forethought, and careful planning. Here's an example of how that process works:
http://imgur.com/a/ERheRFuck me! Visual basic came out 20 years ago - where have you been, man!
Are you trying to state that it is easy to make an GUI?
Err, Yes. High school kids make GUI's all the time. It only seems to be an issue with the XMR MONERO developers. Perhaps they think that MONERO users are too stupid to type commands on a CLI.