If you are happy, I am glad too
But the thing is, there are so many special programs that it does not make sense for everybody. For example, you need Sibelius only if you are not satisfied with Cubase' and Logics' score editor, or if you need more special functionality of this high-end notation program. I for myselve mainly need it for PostScript integration of layouting songbooks as I am no music composer, …
You do not need Vuescan if you have no scanner, or you need another scanner software if you for example like to use a Dia-scanner including batch processing of film stripes, what VueScan cannot provide, even if it makes nearly every scanner usable at Mac OS.
You see the point?
But if you like to go for a "show down" what Mac OS can do, just go ahead and install all of them, or even go to macintoshgarden and macrepository and download another 5k programs.
BTW, if it is really for "nostalgia" I would recommend to use your G3 with just NOT carbonized programs, and Mac OS 8.6 – and be fascinated what Mac OS once was!