They truly paved the way.
Blackpink for obvious reasons.
Twice made survival shows a thing and put hype to foreign member lines in kpop girl groups (you're welcome Sakura).
Mamamoo put the female empowerment idea in the map, first big group to bring self written songs and Hwasa solified a more westernezed fashion along with Blackpink. Nowadays we can see G-idle being a more fresh version of MMM.
Stan legends, stan 3rd gen