I can think of a few reasons. One is that Apple want to minimize cruft and crap bloating the install. I think my fresh install weighed in about 6 GB or so. Very

I can think of a few reasons. One is that Apple want to minimize cruft and crap bloating the install. I think my fresh install weighed in about 6 GB or so. Very nice, just 20% of a 30 GB drive. Another is that software still built with old tools and compilers will still be using old deprecated toolkits, more cruft to keep running, and likely will be unsupported, potentially creating a crappy user experience. It is really neat that really old stuff still runs on Windows, but why are people still running crappy old 16-bit software?