Sorry, just seven pages of ads about vacuums because I bought one six months ago and links that all go to the same regurgitated article that only vaguely mentions it 🙃
Please tell me no one thinks that evidence < anecdotes? Please, for my sanity...
The sad state of knowledge & logic aside:
There is SIGNIFICANT value to proving something we all think is true. This means action can be taken, it can be cited in argument, and is actually credible as opposed to a "feeling" that's it's worse.
Sure, we "know" it's worse. I've experienced search results getting worse and worse for what seems like nearly 10 years now. But I have no proof of this, as such it's an anecdote.