And my experience is that I'm an old school technical blogger who writes articles certainly not for the "entertainment" crowd, but for the professional crowd. My readership stays high from Monday to Friday and drops to nearly zero over the weekend.
Over the last 10 years, I have observed that my readers come from referrers like Google.com or Google.de less frequently. I would say that I get about 20 times fewer readers from Google. However, Google still constitutes about 90% of my readership, down from perhaps 97% to 99%. These are the facts, looking at my analytics.
The other 10% come from DuckDuckGo, Bing, Yandex, Bitbucket, MS Teams, ChatGPT, Perplexity.ai, Atlassian, Swarm, Ecosia, topical forums, and company domains. The share of readership from sources other than Google used to be closer to 1% - 3% in the past.
From my experience as a user of Google, I also find it much more difficult to find experts in any given field. About a decade ago, I would find so many more hard-boiled technical blogs. Now, the mid-level college essay-style knowledge is much more promoted. This shift makes sense for Google as an ad company, even if it harms everyone, future Google included.
With all that said, here are my conclusions, based in the reality of my own technical blog and its readership -- Google is worse for the technical crowd, which is now more likely to share technical resources by word of mouth (like Atlassian, Swarm, Teams, topical forums and company domains) or find them with other search engines. Google's effectiveness has not significantly diminished, as it still accounts for 90% of the way people reach my technical blog, so it might still be very functional for this purpose. Challenger search engines appear to have gained a significant stake in the tech crowd, a contrast to the scenario 10 years ago. But it seems like the decline of Google is a bit catastrophized.
These are only thoughts from my perspective, though they are grounded in some objective metrics.