How did the discovery of early quenched galaxies by JWST challenge previous theoretical models?

Answer

It implied that massive galaxies matured and quenched far sooner than expected in the early universe.

Previous models suggested massive galaxies needed substantial time to build mass before quenching; the new findings show quenching happened at an astonishingly rapid rate in the infant cosmos.

How did the discovery of early quenched galaxies by JWST challenge previous theoretical models?
Spacegalaxiesastronomycosmologydead galaxies