The former is fine, only causing trouble for oneself, and the end of cultivation is the Longevity Realm.
But the latter....
Taking the reincarnation of Golden Nature as a reference, while alive, one wraps part of their True Spirit with Golden Nature, reincarnates in the Mortal World for cultivation, accumulating over several, dozens, or even hundreds of lifetimes, integrating them into one to ascend in realm.
Those who practice this cultivation technique are all people with emotional detachment.
Because after the reincarnated body returns, it is identical to one's own experiences, without any emotional loss, except that they choose not to inherit the interpersonal relationships of the reincarnated body.
This is normal.
After all, in the series of reincarnations, there are always lifetimes where one would marry and have children. Upon returning to the original body, if they were to inherit all these relationships, it would be truly overwhelming.
