Why use a GUI framework?

[Jane Doe]

Hi,

	I know a bit more about the multiple options available to
build a GUI-based application (Windows, in our case), but I haven't
found information on the point of using another tool since the
win32all extension is available to use the native Win32 widgets. 

Do wxWindows et al. just make it easier, or is it a must-use for
people who wish to write OS-independant Python applications?

If win32all is good enough, does anybody have a good tutorial on using
this add-on to build GUIs?

Thx much
JD.