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Aretheus In your original post you ask about what the function of the spirits are, what they'll do for him. You use examples of things that made the character powerful in other series you liked. You asked what you should be getting excited for. I don't think its a stretch to interpret this as "wanting the spirits to make the character powerful", especially since his connection with them was given by god as a reward to help him in this other world, something that usually makes a character OP. I hardly think that warrants snide passive aggressive comments accusing me of projecting.
Moreover you seem to be agreeing with me on my main point: that it is the core elements of a story that make it good, not merely its trappings or its gimmicks. Although I might disagree with you over your examples (I think Mushoku Tensei's strong suit is the power of its emotional moments rather than its themes (though I'd still say those are good), and I'd argue that Slime's characters are largely flat, static, and uninteresting and that its strong points are its world and the central element of state building), we seem to agree that what makes for a good series is not a power gimmick or an OP character, but something more fundamental. My point in the first place is that this series is already enjoyable based on some of those core elements. I enjoy it for its tone, its characters, and its cute aesthetic primarily, and for the mystery of what the contracts with the spirits will do for him since he can't use magic. Yes, I'd call the seeming near uselessness of the spirits an attractive point of the series. It has been plainly set up that the spirits are quite powerful and impactful in their own way and the question of how he might end up using them is intriguing. It's actually a little ironic that you bring up Chekhov's gun since I'd argue that the spirits are following the idea of it quite well. They've been set up already and now we are waiting for them to be fired.
I simply do not agree that every isekai needs to go through the same bullet points in its premise. All an isekai needs to qualify as isekai is for the character to end up in another world. They don't need to be stuck there, they don't need to be reincarnated, they don't need some gift from god or a similar entity, although most series include these regardless. Yes, I'd agree that an interesting an unique premise that sets it apart is good, but its not necessary. I've enjoyed plenty of series with very basic premise because they simply did a good job of telling their story, and I've been disappointed in plenty of other series with great unique premises because they went nowhere with it (I've found everything Funa writes fits this to a T). This series is so far fitting in with the former category. It's not exceptional and I wouldn't blame anyone for not being interested in it. I don't even really mind it being dismissed offhand for not being especially unique, because the market is absolutely glutted with generic boring isekai that go nowhere. However, I would still argue that dismissing it like that is not entirely fair because it does have some unique aspects that can act as its selling point. For me it is the feel of the story, the sense of lightness and sincerity while still being able to get serious when necessary, that is its selling point, not the spirits. The spirits are merely a gimmick. I would agree that they aren't very good as a unique selling point by themselves, but they absolutely serve a purpose, both for the narrative and the tone, and honestly they don't need to be the selling point.