If you allow me : how many people you work with can actually perform those Jepsen Report ? Or is it only you ?
There's a lot of folks out there who can do basic testing work with Jepsen. I've taught... I dunno, maybe a few hundred people directly in Jepsen workshops. A couple people have worked alongside me, and I'm sure lots more have learned from the docs online. Writing a report is a more involved problem--certainly not intractable, but for me it involves testing, experiment design, lots of reading, doc review, writing, editing, finding reviewers, and of course all the business stuff.
I don't know why all the DBMS vendors don't just have a guy on the QA team whose job is to run and interpret Jepsen tests for every new version. It's certainly a better option than eventually getting a damning report written by you.
As an anecdote i was surprised to discover mongodb had a second life in the corporate world as a standard , certified technology to store critical documents. So yeah, maybe people aren't really that aware of the kinds of nasty gotchas that lure in their systems.