The complexity of the systems (mostly!) reflects the reality of the needs. Thousands of services working in orchestration in an environment that is, by definition, hostile; is non trivial.
Little parts of a system being over engineered may be the fault of an engineers ego somewhere, but the massive complexity of distributed systems isn’t some ego trip or frivolous fiddling with shiny new tech.
It’s just big and hard for mere mortals. It’s hard to say when k8s actually decreases complexity, but I think most will get there before ~100 software engineers do.