Blarney - Yes, indeed, very many people did expect KDE4.x to at least have an optional setup the same as KDE3.x. Possibly because they weren't just arriving in Linux and thinking that "KDE4 is Linux" - it probably would attract the iPhone folk - and those who buy $500.00+ cameras with Priorities and Manual controls, then only use them on "Auto" - not to mention that costs-saving camera makers have been able to "trend" some folk into spending hundreds of dollars on cameras without Viewfinders...
Of course, I am indeed waiting for for costs-saving car-makers to "trend" buyers into engine-less cars - very low petrol/gas usage, good for the environment - operated in Fred-Flintstone mode... (Here in Australia, I can imagine at least some friends being lazy enough to dislike Fred-Flintstone-propulsion, and start screaming for "Classic Mode" un-trendy cars - with engines...

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What seems to have happened is that folk who started into Linux some time back - say, turn of the century, with Mandrake and the then very new KDE - spent the '2000s' getting used to Linux - with KDE, KDE2.x and KDE3.x. So when the totally different KDE4.x was hatched - those used to "traditional" KDE did indeed want a familiar "KDE3.x-style" option in it.
There are so many thousands of complex functions in KDE4.x that adding an "Install as KDE3.5 Classic mode" - or having the option after install - might only have added 5% to KDE4.x, and, compared with making KDE4.x itself, very simple. Then those who preferred could have had that familiarity - but with all of the new versions of apps, etc.
However - that would have had the great majority of then Users preferring that mode. New to Linux folk might have thought KDE4.x mode was like proprietary Mac, etc, and used it - while the longer-term Users might have begun changing to KDE4.x mode over the next 5-10 years, as they played with it and got used to it. That is, they wouldn't have been forced into using KDE4.x, to get all the KDE-related apps and functions (like Kim, etc) - and trying to get those into User-Usable modes.
Uggy - Yes, indeed, Linux used to be a whole fun-adventure - and such a darn-quick, good, easy, efficient system - particularly with the KDE, KDE2.x, and KDE3.x - all aimed at the Home-PC Desktop User...! I suppose this new "fight-the-enviro" game KDE4.x presents is "fun", too - or might be if it wasn't such a dog's-breakfast of mismatched awkwardosities...
Just18 - Yes, as far as I recall, all "advices" you've ever given - once understood - have turned out to be correct... So I've again misunderstood your advice - as in my "Fred" logon - I'm getting the same foul-ups as in this logon. Or - perhaps, earlier in the Fred logon, while trying to make it "usable" - I introduced the same "glitch" I have in this logon...? Certainly possible... So think I'll delete "Fred" and create a "Ned" logon - but leave it 'untouched' - until I study your Advanced Instructions in great detail...
Regards, Dave.