If you NEED a latest system, then that's fine. Some of us do, for video editing or media production. Yes you can do that on a G3 or G4 but it will have you tearing your hair out.

The problem is when a word processor needs an 800mhz processor to run and 15 minutes to boot (Word 2004?), but has NO new or intensive features over the 1994 version that ran on a 486.