"In a case where let's say someone has an ascendant level talent and hails from an S ranked home planet, does that mean they cannot attain the ascendant level?"
[Yes, since their planet only has worldly natural energy that can sponsor growth up to the S rank, their ascendant level talent will be worthless.]
"I see." Nodding in understanding, Kailen sighed heavily. He was digesting everything he had learnt. His entire worldview had been shattered. He felt like an ant, completely powerless; his confidence in being strong, shattered.
"Heh, as they say, a frog at the bottom of a well whatever, ah forget it. Can't remember the idiom. In the vast cosmos, the current me is literally a bug than can be crushed by literally being step on."
