We don't. That's good justification for you. To me, the process being as straightforward as was explained, the whole deal came off as funny that even not even one of generations and generations of U6 Saiyans not as proficient as Caulifa have come across it.
It only looks straightforward because of cauli.
Cabba was convinced you
can't do it without experiencing the transformation first, he tells her this straight to her face.
And then he smiles in a 'lol that's cute' way when she tries it anyway. That smile quickly turns into surprise and amazement when she finds the sensation on her own.
I dunno, with all of cabba's dialogue it really doesn't seem like it's a straightforward process, just because he explained the sensation.
The entire scene was kinda setup to be: "this cauli girl has insane potential"; she even generates that 'broly-like' energy effortlessly, but seems surprised that she did it.
The scene was less about "lol ssj so easy" and more "be on the lookout for this saiyan girl during the tournament, she's mad powerful yo!".