Exactly.
This whole debate is almost based on pure head canon. The only clear thing we know is that U6 sayians evolved differently than their U7 counterparts. THATS IT. wtf that even means we don't even know but it's not even hinted at in the series that this being the reason they achieved SSJ so quickly.
People are just picking and choosing whatever nonsense makes the most sense to them to make up for the bad writing.
I'll sum it up as to why the U6 transformations are stupid.
SSJ was a transformation that could not be taught. It had to be unlocked/unleashed. SSJ was a very very rare transformation that was legendary to the sayian race. Goku achieved it and then did Vegeta who we know for a fact that these two individuals are no ordinary sayians, Goku being a prodigy and Vegeta being a genius.
The point is we know why these two were able to attain this form. But when it comes to U6 we don't know shyt about cabba, kale, or califla. We don't know if they've ever had to fight for their life or if they've even trained at all. We don't even know if they're the strongest saiyans in U6.
So right now they just look like random saiyans that have gotten decades worth of powerups in a matter of 2 weeks. And I would be 100% on board with this if they just took the time to explain why?
It's just bad writing. They introduced all these universe but didn't bother to world-build around them. Threw in all these different characters and expected us to just shut up, watch and give a shyt about them.
Jiren is a result of this bad writing. Nothing interesting about him. Just strong for the sake of being stronger than Goku. Created for the sole purpose of introducing a new form. They built up the Pride Troopers so much but Jiren doesn't even seem like he's apart of the group. He's just his own entity.
Dragonball is not a complicated show but when you leave so many plot holes and unexplained events around people are going to do their best to make sense of it all. This SSJ issue should have been explained long ago but the writers are too busy hyping up a dumb transformation.
This is the future of Dragonball. Overhyping new transformations, new characters, new fusions, all at the expense of a coherent story.
Seriously I felt what he was saying. The writing is fukkin terrible for Super and I seriously think they should wrap it up after this Saga. All they pretty much did for the Universe 6 saiyans is pretty much mirror the universe 7 saiyans but opposite. 
ain't need to see all that over again
