It's true when they say that a lot of true talents aren't appreciated in their own era, because while f(x) still had a very successful run, they never really got as massive as their talents and music warranted.
If you ask me, they were way, way ahead of their time during 2nd generation, when the public couldn't appreciate their concepts and music as much as they would be today.
Now I know there would be a weird timeline paradox, since MHJ couldn't be at SM serving as f(x)'s creative director AND be CEO at ADOR managing NewJeans...but what if f(x) debuted under ADOR
That silly hypothetical aside, till this day, there hasn't been a group as unique or quirky or sonically brilliant as f(x), and I think they would be battling for top girl group status if they debuted today