Labeling UI frameworks as artificial complexity is simply a sign of inexperience manifested as NIH syndrome.

The vanilla approach is fine for a personal or toy project, but it's an unmitigated disaster for a project with even a moderately complex UI.

Eventually, the vanilla project becomes its own bespoke UI framework with a bunch of poor design choices because all the complexity that was dismissed as "artificial" eventually gets patched in using a rube-goldberg-machine approach to architecture.