Here's one (an example of what's changed):

easy for software to commoditize hardware... hard for hardware to commoditize software. (Spolsky 2002)

Linus effectively killed the golden goose of writing OSs, a super-difficult task that deservedly propelled Gates and Allen to the stars.

All it takes is a college kid and a laptop to ship software. I wouldn't know where to start building and shipping chips and circuit boards. And that's why Azure, not Office, is where Microsoft's placing its bets.

The core concept hasn't changed. We have a lot more data about what works and what doesn't. Back in 2002 funding for development tool companies and open source companies was non-existent. Git or github didn't exist. Things changed.