I would say another key change is things just becoming less modular over time.
Like, the chipset used to be a major factor in choosing your motherboard, but it just doesn't matter anymore. Third-party chipsets are no longer a thing, and there's little difference between first-party chipsets anymore because every CPU has a full integrated northbridge now.
And honestly, today's PCs are powerful enough that there's no point in even bothering to make optimal choices. You could pick mediocre parts for all your stuff and still end up with a beast. It's not like the P4 or Athlon XP days where you'd feel it if you picked a bleh motherboard or something.
I must admit I therefore was only vaguely aware of the site. (During "my time" Tom's Hardware was quite a thing but probably they cater mostly to overclockers and gamers)
Would be nice to see a renaissance of DIY computing though. MacBooks do become a little bit boring :) On the other hand I do run a small homelab by now
I used to be a regular reader of AnandTech since the early 2000s and the delays are what drove me off the site. Specifically when the Nvidia GTX 1080 launched on May 27, 2016. The AnandTech review came out 2 months later on July 20, 2016. [1] I had no problem waiting a whole week, but after that it was getting ridiculous. They just didn't serve their readers.
After I found replacement reviewers, mostly on YouTube, for my in depth reviews, I never went back to regularly visiting AnandTech. Their time had already passed in 2016 as far as I'm concerned. Not only were they delayed, but their reviews weren't even the most in depth any more.
--
[1] https://www.anandtech.com/show/10325/the-nvidia-geforce-gtx-...
Maybe unavoidable, but the level of ads covering the website also made it borderline unreadable...