Aren’t you going further from the definition though?
Any short definition about EA by itself I find to be abstract. Most people I encounter assume it’s about doing as much good small things as possible—or worse that it’s a political philosophy (red/blue thinking). It’s only when I give examples of myself or ask what their cause interests could be that they slowly break away from the abstract dictionary definitions.
Following a preference utilitarian system, you are correct. Hare discusses this in, Why I Am only a Demi-vegetarian. Singer also mention it in, Singer and His Critics.
Although, that’s not the reality today (in the US at least). Unethical living conditions, such at battery cages for chickens or a short life confined to small pens for other livestock is the point. No such being wants to suffer unnecessarily. On the other hand, if factory farming was like ol’ MacDonald farm, then sure. Kind of a paradox...