I worked on a product that used BPMN where users could define processes. The company I worked for used Java for decades already. Clients of the product were banks.
The people I worked with were not specifically HN audience. Rather in the Java bubble in Germany-Austria-Switzerland which is also surprisingly a small world. If BPMN is not really needed, then I would also not use it nowadays. It increases complexity, and who knows if it makes project communication better at all.
Update: On the Camunda website there are 60 case-studies of customers/clients using BPMN, https://camunda.com/case-studies/. One of them has the teaser: "The 10th largest US Bank created an omnichannel onboarding platform that handles 12m process instances per year across 100 workflows". Now I have something to read for this Sunday evening.
Camunda (not affiliated btw.) crossed 100M ARR last year. So yes, this apparently is being used. Whether these users hang out here on HN or not, that I don't know.
