why don't you get you facts straight: with a unix system it is nothing very special or outordinary to have as many ius and look and feels as you like. windows traditionally has only one at a time an traditionally is a single user system so that this makes sense.

you can have as many differnt ui's run on the same phone as you want. any ui is just a bunch of applications you install and run. and you run as many as you want and your resources allow you. yes have a gnome, a kde a fluxbox, a matchbox run on the device simultanously as long as your memory lasts.

with that i do not want to smallen efforts to create a iu for phones i really appreciate the work of everyone trying to achieve this. but it is just a application system like any other, like a game or a navigation system. like you have opera and firefox o rlike different mailclients or or. you install as many of them as you like and have as many of them running at the same time as you like(if you like). and if you install easy debian, you see that in action: two completely different ui's running simultanously on the n900. and it has always been that way with unix. for decades. even with dumb xterminals - yes: xterminals executing applications on a server for decades. even same applications with different uis... nothing special, just an application you start like any other.

so if the ui is not intuitive enough for you: go and just install a different one. yes the problem for a casual user now is: he will not be able to install it for the one he might want is not available in the dist. but the latter is the problem. this is the odd thing. not if your taste is better than the one of others.(funny enough: with desktop and ui it is just as easy as that: download and start it).