So what the Kree decided to use the DNA of random a Boston housewife to make Lauri-Ell because... reasons?
Never got the hubbub around Carol's retcon as it's best kind of one, it's additive and expands the heroes lore and adds depth to Carol family while not changing any the events that actually happened.
It gives Carol a more direct tie to Kree and makes the source of her power tied to her own history and family instead of it being just a footnote in Mar-Vell story.
I've read the original Captain Marvel/Ms.Marvel runs and the whole Psyche-Magnitron was very much a plot device and largely an excuse to explain Carol's powers, the original story itself had little to do with Carol herself and once Mar-Vell rescues her the book promptly forgets about her and moves on.
It adds some complexity to Carol parents and her estrangement from them rather than just being cruddy people and certain moments like Carol mom instantly knowing about her superhero persona better in retrospect.