Jirou taking on Subaru's dream of being a butler made no sense, (she gave up on that dream to be able to date him freely as a girl and now that she doesn't have to hide the fact that she is a girl she can have a normal highschool life and make friends) and him proposing right after that also made little sense, the author just used that as an excuse to not have to actually do the scenes where he turns the other 2 down and for the sheer shock factor. But buy becoming a butler and the other 2 girls also becoming maids they can now all live in the same house again, which just felt like a cop out, i mean he had to choose one of the 3, which he did, but he still ended up with all of them in a way, happy ending i guess ? although i don't see how you could hire someone who rejected your love to be your butler and also the one he chose as your maid, you would be reminded every day of your misery and their happiness.
This dream of Subaru's to become a butler is proven to be even more idiotic when at the end she is hired as a maid instead, like what the fuck ? why couldn't she do that from the beginning ? because there would be no premise/point to the whole manga, that's why, which shows just how weak the foundation of the whole thing is. But i guess you can't look at this manga in such a serious way, just like any Marvel/DC hero's story falls apart if you think about it even a tiny bit. But it's hard for me to enjoy a story when the premise is so stupid or not properly explained.