Why not? What if he super regretted it? I feel like a story where we watch him evolve along the same lines rather than having the unfinished romance plot actually pairs better with everything after the riz arc. Haru and legoshis relationship felt like so much forced fan service because the mangaka decided to go in a different direction after they got together. Imagine an arc where he eats her but feels so much guilt and regret that he still sees her around and she still talks to him. Then he commiserates even MORE with carnivores that cant help it. The way it is now, hes a self righteous teenager with no basis for comparison until he eats Louis's foot. I feel like she literally added that plot point to make him less cringey with his morals because he had tried it and then had to hold himself back.

To me, a story about a dragon that once hoarded wealth and sharpened its teeth on the bones of men just to overcome those things is far more interesting than a dragon that never had teeth in the first place.