All the stuff you've mentioned is pretty niche, and, as someone mentioned somewhere above in this thread, mostly done this way by the cargo cultists who defiled

All the stuff you've mentioned is pretty niche, and, as someone mentioned somewhere above in this thread, mostly done this way by the cargo cultists who defiled the sacred Unix Way. Look at a typical Unix distribution, count how many packages depend on sqlite or berkeley db - a tiny proportion of a total number. And, no, file search and all that fancy UI stuff has absolutely nothing to do with OSes. It's an application level.