OS progression amongst Windows, Linux and OS X has caused heightened system requirements since their initial releases, so this is not so much distortion caused by Apple, but the developers of every OS...?
But I get your point, it is much more prominent with Lion than Windows or other *nixes.
at least windows7 and linux can run on less then the recomended hardware , slower yes , but thats not the point nobody would expect windows7 to run speedy on a say 450mhz pentium 3 , but as youtube proves it its possible to even install on a
http://www.youtube.com/watch?v=lqdmVOgellQ 90mhz amd cpu
so windows 7 , remember microsoft does not build computers can run on more then 10 year old hardware from whoever the manufacturer was (with emulation on PPC too if enough ram is there )
and linux well it does run pretty much on everything you want it to run on
i installed ubuntu 9 , excuse me as at that time it was the newest on a old AMD K6 300mhz and 4mb vram GPU and on a iMac G3 700mhz ubuntu 10 and it run fine
and again its not about speed at all as long as everything loads eventually its fine
i for example dont get stressed out and ready for a shrink if My Mac's take a moment to wake up , or a app takes a couple minutes to load , or if i can only watch youtube in 240p all that is not important , the important thing about PPC Mac's is they are still usable computers that still get the job done , even if Apple want them to be in museums and not on peoples desks any more, so let us and other enjoy our old PPC Mac's , its enough that apple wants you to buy every 12 month a new Mac to stay ahead of the game , we just dont follow that trend
sure our PPC Mac's cant run snow leopard or Lion , but that is everything but not the fault of the PPC architecture , Apple could easy have developed those newer OS to run on PPC too
for me its a question of why should i spend £2000 on a MBP if i could get the job done on a £200 iBook and its only about choosing the right software to get those jobs done , in my opinion and some might agree only because a app is 5 years old does not render the app unusable
Mac's and apps dont have a use by date.. ok i am a bit wrong there with Apples tendency to render hardware unusable with new OS's after 5 years , so you could say they build in a use by date in the OS , but not because the hardware could not cope , best example and a new one is the lion official restriction to core 2 duo ,ok can be made to run on core duo's too, but not officially , because they want to sell you a new Mac and its not in their interest if you keep your Mac longer then 3 years , Apple is a profit based company not a charity