Seriously, every single unit runs through that one pipe?

Your sister's view misses how sad endings often make stories more meaningful. Shows like Your Lie in April use pain to show real human experiences, not just to upset people. Art doesn't always need happy endings to be good or important. Try explaining why the sad moments mattered to you personally instead of debating the ending. Ask her what she values in stories too, so it's a talk, not a fight. Finding common ground might help you both enjoy discussions more.

Wait, you mentioned a refractometer, so you have the tool now. How often are you actually using it to check the mix? I messed up for ages by just eyeballing it too, and it totally wrecked some inserts before I figured it out. That weak mix doesn't lube right at all, it's basically just colored water. Are you checking it like once a week or just after you top it off?