I’ll wait.
I’ll wait.
Journals in general serve to curate an ever-increasing body of research and provide a crude method of gauging scientific quality, relevance to your field, and importance. They provide a crude method of judging the impact of scholars without having to read every single paper ever published.
Publishers specifically put in grunt work to make the curation process function. That means hiring people to coordinate the peer review process, identifying new fields that are in need of new journals to help disciplines form and mature, ensuring standards of the scientific method are being followed, and of course there's the commodity service of hosting digital content.
I think a more interesting question is how much the role of a publisher is worth (as opposed to whether it should not exist), and whether there are ways to fill the same role with a cheaper alternative.
But what you say about commercial academic publishers is a relatively recent development. Traditionally, universities and professional societies ran journals. As you say, publishers did the grunt work. However, they did it on a work-for-hire basis. It wasn't until the 50s or so that profiteers took over the academic publishing industry.
if commercial publishers are doing that now, it means that academics have dropped their responsibility on this.
Otherwise you haven’t mentioned anything of actual value.
Open access journals are basically the same as traditional journals, they just charge authors up front, rather than readers later. I don’t understand what you mean by your sentence above - they haven’t demonstrated anything close to what you claim.