I worked at a place for a few months where they had this very complicated K8s, Argo Workflows architecture for processing some Bioinformatics data. Felt cool when I joined, but it clearly was way over-engineered.

I started with a proposal on how to simplify it and went about developing a POC. However, a couple of months in, I realized that the company actually had NO customers for this. And multiple engineers had worked multiple years to get this to the stage it was. I had 0 motivation to do anything after this, and left soon afterwards. I think they are still working on it!