The scientific evidence we have so far all points to cats being able to thrive on a properly balanced/supplemented vegan diet. Cats need certain nutrients in certain ratios, whether they’re from animal flesh or not doesn’t really matter in the cats digestive track. I can link some of the studies if you can’t find them (check out the vegancats subreddit wiki, fuck reddit but it is a well compiled resource linking the available evidence). As usual with science more research is needed but the evidenece is already very strong in favor of nutritionally complete vegan kibble.

The arguments against nutritionally complete vegan kibble also apply to non-vegan kibble, so you’re either against all kibble or you’re a hypocrite.