The theory says, by cooking meat, it makes it easier to digest, creating less work for our stomach / more blood and energy for the brain, which helped us evolve into homosapiens .
Considering we are well into the evolutionary stage, and still mostly eat cooked meat, it’s all good!
Cooking may have helped destroy toxins from plants allowing us to eat more and more broadly. But heat only destroys nutrients. It does not pre-digest.
As you have said-especially around wild plants, you need to know what you are doing- seemly innocuous plants eaten raw can be fine but heated are deadly and the reverse applies too.
