If obligate carnivores literally cannot absorb nutrients from plants, does anything good come from ingredients like apples, carrots, blueberries, flaxseed, etc in cat kibbles?

I got no replies in AskScience :(
I am trying to analyze kibbles more - I know the negative impacts of fillers like corn, potatoes, peas, etc, but is there anything positive cats can get from the non-meat ingredients in kibbles, or do they all literally just pass right through without any nutrients absorbed? A friend of mine is focusing on the effect of heat on kibble ingredients and how the nutrients change when extruded/heated. But now that I'm thinking about it... why bother looking into how heat would change the nutritional value if they aren't getting anything from it in the first place?

submitted by /u/JaffGiraffe
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from Pets https://www.reddit.com/r/Pets/comments/bwx4mn/if_obligate_carnivores_literally_cannot_absorb/