I'm not sure I buy the idea of yet another distro with GUI.. There are over 100 (
https://en.wikipedia.org/wiki/List_of_Linux_distributions)
..and many of them have been out for years, This PIXEL is very 'basic' and may be another one that started as a good idea with good intentions but will run out of steam and will be abandoned (at least on desktops).
I mean great that kids/companies have a Linux GUI for the Pi but frankly speaking, if you have a desktop Windows/Mac/Linux why would you change to PIXEL?
And if you have Pi as the main computer..
you'll commit suicide in 2 hours of surfing or basic stuff like banking or youtube.
I don't think we need more, those developers could work on improving KDE, GNOME, etc.. if usability is a problem...