Facebook, Twitter and other quick-shot social media were some of the early driving forces for many people to use the Internet as part of their daily lives. But, they pretty much killed off email lists and forums. It's a shame, because sometimes people want to have actual conversations about complex topics, not just post a pic or spout their opinion in 140 characters or less.
Insofar as computer cases go, the better ones back then were sturdy and never cut your fingers. They were TANKS! But there have been some very good shifts, such as modern tower cases putting the PSU on the floor & fans on the top, as well as tool-less drive slots. The airflow in some newer cases also outperforms anything from the 2000's. With a micro-ATX board, it even allows for mostly passive cooling and practically zero noise. But don't fret about today's cases being bland and identical and well, all looking like they belong in the Bat-Cave. There has always been a thriving case mod community. A few nice examples:
Steampunk:
Dieselpunk:
Art Deco / Rivendell Elf:
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“For small creatures such as we the vastness is bearable only through love.”
―Carl Sagan