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Toyota Will Adopt Tesla-Style Cast Bodies That Might Be Impossible to Fix
(www.thedrive.com)
This is a most excellent place for technology news and articles.
The frame is a much smaller portion of the vehicle than these cast parts.
Once a frame is damaged the vehicle often gets totalled out because it would be so much to replace, basically disassemble the vehicle or try to repair the frame and have poor safety risks from then on.
These casts are a lot more than where a frame is. Damage to the casts will happen from accidents that never would have damaged a normal frame.
Not on a unibody.