pretty much confirming my hunch that it's not an Eternal September problem with Twitter, but that it started being shit after Oprah and all the other celebrities started using it and it being popular as a source of news.
It's not an influx of newbies at all. Social media can be full of literal clueless newcomers - it just needs to be social and not corporate.
It's why reddit is dying too - everyone suspects it and the actual effect is less opaque that it's also jumped the shark and is no longer democratically social but corporate / PR influenced.