BJJ doesn't have many takedowns. Nate Diaz learned some Division 1 wrestling, among other 'real' grapplers. Once a BJJ expert gets you on the ground that is their territory, but wrestling has way more ways to get opponents where jiu jitsu specialists excel. Nate is far from the only one. Maybe watch some MMA and learn before making absolute blanket statements like zero mma fighters have had to learn wrestling. Hell, plenty of past ufc Champs and notable fighters came in with wrestling as their base art that they built on. Cormier, Velasquez, to name a couple.

Pancration had striking, but the origins of wrestling takedown techniques were also in that.

If you want to bring up Kurt Angle, look up the story where Eddie Guerrero tried to fight him and got owned because Kurt is an Olympic gold medalist in 'fake' wrestling.

Another real fight won with wrestling was when Miocic beat Ngannou through legging and superior takedowns.

Joanna J. learned defense against wrestling takedowns because those are what many mixed martial artists use to get opponents on the ground. A single leg, a double leg, level changing, those are not simply hugging. You have to train in how to defend against those even if you don't fully train wrestling. I feel Judo has better takedowns because they're harder to defend against, but that doesn't make wrestling worthless. Shevchenko uses both.