I don't think there's any point at which seed oils are beneficial to the body
The main fatty acid in most seed oils is linoleic acid, which has a clear disease pathway:
Linoleic acid metabolism is suppressed in diseased individuals:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9722286/
Linoleic acid levels are significantly associated with HNE (which linoleic acid produces when oxidized as in cooking) in both the general population and even more strongly in diseased individuals:
https://www.sciencedirect.com/science/article/pii/S2213231713000979
HNE is "the most toxic" aldehyde and involved in "important neurodegenerative diseases such as Alzheimer's disease, Parkinson's desease, multiple sclerosis and other diseases such as cancer, diabetes, inflammatory complications, atherosclerosis, osteoporosis, cataract and age-related macular degeneration." :
Also I'm looking for specific claims about the rate of oxidation and not seeing a paper on that topic, but I am seeing plenty that claim various connections between (dietary) linoleic acid and disease:
https://openheart.bmj.com/content/5/2/e000898
https://pubmed.ncbi.nlm.nih.gov/10671267/
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