I can appreciate how much thought the author has made to show how a common gacha mechanic is actually rather fucked up if the heroes summoned are assumed to be individuals with their own humanity. As someone who has played a bunch of gacha over the years I've certainly made use of some burning/disposal function precisely to save space. I've actually considered the morality of what I'm doing occasionally when doing this but this certainly puts it into clear contrast. I know what I'll be remembering next time I have to clear my summon inventory.