There's no reason why supplementation shouldn't be possible. After all we're already doing that

Zooming in on this statement right here, we’re already doing that, and it doesn’t work.

Obviously we can test for it (since so many people in this comment claimed that vegan brands were tested and found to be insufficient), so nothing stops us from putting taurine into the cat food to the point where it reaches the required amounts

Except for the parts where it doesn’t work

It's that simple

It really really isn’t.

If you need to stay offended than for all means keep going.

I'm not offended by anything, I think the whole discussion is comically stupid. The research done into the subject is lacking, because it's a bad idea and everyone involved knows that. I guess there are worse things for an internet forum to be arguing about.

Just know that you behave just like the vegans you’re so annoyed about, and it’s showing.

I feed my cats the food they need to survive, fortunately.