I use hierarchical modeling regularly to help build Zapier. So do other companies like Generable: https://www.generable.com/
I suspect hierarchical models will become the next “new” hot data structure in software engineering due to their ability to compact logic. https://twitter.com/statwonk/status/1363104221747421184?s=21
When I was working for one of the FAANGs, I was the only one using random effects models (that I know of), in particular non-linear random effects models with ~ hundreds of random effects. I was using a language/tool faster than Stan (fitting the same model with Stan would have taken hours, or more likely days), but making the models converge was always challenging. In addition, since most of my colleagues had a CS background and were in love with the latest not interpretable, brute force algorithm, and were scared of a more statistical approach they made no effort to learn, I faced pushback and skepticism despite the model working very well.
I love random effects model, and I build my technical career on them.