I appreciate the insight here, but I'm not sure the analogy fully holds. From a player's perspective, Riot are the ones who are ultimately in charge of maintaining the quality of both the restaurant (Eternal) and home-cooked meals (Rotation). As a player who will only be interested in the Eternal format because that's the only place I will be able play my favorite champion, it is unclear to me how "cutting costs" by focusing more on the meals at home doesn't lead to issues with me continuing to eat my favorite dish at the only restaurant I can still go to.
In this analogy, bug fixing is the diapers - not the restaurant.