Horn: Well, "while keeping it interesting"--sure, I'd agree, but there are a bunch of manga that go on forever about cute girls randomly interacting in some kind of half-assed school club or whatever, doing mild comedy and maybe pursuing yuri relationships which never really get anywhere and are half there as comic relief fodder. The art style here and some of the interactions feels just like them.
On the cliche thing--well, everything is relative. Sure, at some level every story has been told umpteen gazillion times before. But that's talking in a very bare-bones way. Person-meets-person, they fall in love, obstacle, obstacle, they get together the end. God, I've seen that so many times . . . wait, that's why they call it "romance", isn't it?
When we say something is "cliche" usually we mean something a bit more than that. Certain kinds of characters, certain particular elements of setting, certain specific plot points, get used much more often than others. Maybe they fit the general culture very well, maybe someone did it once and sold a billion copies, but in any writing environment (like Japanese shoujo manga or North American fantasy novels or whatever) there are some "bits" that are floating around ready to use because they've been used so much lately. If an author just kind of grabs a bunch of those and doesn't add much to 'em or change anything up or grab any bits from elsewhere, we call the results cliche and I don't think there's too much wrong with that. And it's totally relative to where and when you are. If I tell a shoujo romance and go back to Icelandic sagas and grab one of the bits that's totally overdone in the sagas, that was a cliche in the sagas but it really isn't in shoujo romance (it might not work, but it won't be a cliche).
People know what it means until they overthink it. Then you have to overthink it even more to get the meaning back.
Now personally, I don't mind yuri or shoujo manga cliches much, at least if the mangaka's adding something, making it her own in some way. I like the genres ultimately because I like their cliches. But I think it's just as pretentious to claim it's verboten to call "cliche" as it is to use the term in the first place.