Blogs are still there, just not easily findable through Google as most of the ones you find are low-value SEO blogs aiming at search engine traffic. Discovery is a problem but I just subscribe to blogs when I find them via RSS (Blogs still have RSS, it's hard to find one without which is surprising but I'm glad that's the case), over time I build up my list of blogs I like and they usually link to other blogs and the…
Google has an unusual situation where search now only needs to be good enough. They are much more focused on the knowledge engine of providing direct answers and the advertising business. With such a dominant market share, search has certainly lowered in quality
I would argue that the public internet has lowered in quality, and the lowering quality of search results simply reflects that the information you're looking for often isn't out there.
A good chunk of that is that more and more info is locked into walled gardens (in some App, on Facebook/Instagram/TicTok), but also a lot of what people want to find in todays world just isn't on the internet anymore, except places like the web archive, where Google isn't allowed to venture...