Your experience seems to be at least 3-6 months old. Long time kernel maintainers have recently written on this subject. They say that ~3 months ago the quality and accuracy of the reports crossed a threshold and are now legitimately useful.

The experience I'm describing was two weeks ago.

Yes, what we see coming out of the bottom of funnel is now is a little better. But it's sort of like reading day trading blogs: nobody shares their negative results, which in my direct experience are so bad they almost negate any investigative benefit. I also think part of this is that a small set of very prolific spammers were sufficiently discouraged to stop.