exactly what i always say, you just dont need for example Ms office 2008 or 2011 to write some letters or spreadsheets it can still be done with claris works and you dont need a intel i7 for that purpose
if you run a Mac with the software developed at the same time you get real performance , today's software might look nicer (beauty is always in the eye of the beholder )and maybe offers more features , but be honest how often do normal people use these added features , and the bloated GUI's of some apps today are really only GPU /CPU and ram hogging without having any purpose
i like to run OS9 and use claris works 4 on my iMac G3 to do nearly all my office work , its still up to the job ,even that development has stopped already before my iMac's G3 600/700 had been build , and office task have not changed in the last 10 years and letters are still written on din a4 paper

i have office for mac 2004 too and it too works perfect on the same G3 iMac's , so for that kind of work i do not need a faster Mac
and there are a lot more apps available that work as good today as they did 10 years ago
i mean take photoshop LE for OS8 and the photoshop 10 for OSX.6 , what has really changed that is important for user x who wants to make some holiday pics look a bit better
ok i only can speak for myself , but i like the simplicity of the old apps , where you dont need to read a manual bigger then the novel war and peace from tolstoy
and wasn't that the big selling point of Mac's once, the simplicity of use?
and the question we read often "how do i do this " proves even OSX gets more complicated with every release ,as more and more features which most dont even know about or might ever use are getting added
and for all who think playing youtube videos is the most important thing you can do on a computer ...get a life
youtube works well on the same iMac g3's above just not at full screen and 1080 p , but most content in youtube is not even worth looking at 240p (thats what i get on the g3's in the window )it might be funny some content , at times even informative , but it wont justify to buy a 27" iMac only to watch it at 1080p