No, I've already stated that is a completely reasonable position. It was the main reason behind my decision to become vegetarian. I don't think it's no cost to everybody though and some people's health deteriorates, particularly on vegan diets. However, being conservative in the face of uncertainty is a different stance than claiming they experiencing pain. It also doesn't address how you avoid the slippery-slope argument. For example, we haven't proved plants are not conscious so how do you reconcile a vegetarian/vegan diet with that? For me, that's why I rely on the biological argument that started this discussion. I have a feeling many people just resort to their intuition. Meaning it's just the same position of convenience you railed against masquerading as principled, reasoned stance.

My personal choices aside, there are also reasonable arguments against it that I don't think we should immediately dismiss with hand-wavy anthropomorphic arguments.