In reply to Álvaro.

We will see how it will work. First I read here about menu in customizer, my reaction was similar, like first emotion "menu in customizer, it looks like too much there''

Anyway true is, that I love customizer and really like to work there. Even if I choosing theme, my requirement is that all settings has to be implemented in customizer, not somewhere in admin menu.
So if menu will be implemented well, I am sure, I will like it. I just hope it will works fully there, not that I will need visit admin menu for some extra job there.

If decision was taken, it would be great, if all capability of menu setting can be there, not just duplicate some function two times.