I appreciate your point, but in terms of potential, it's best have a grounded discussion in terms of having reasonable expectations, and not the firecircus that was the game's launch.
I agree to the extent that hype culture tends to propagate a kind of collective hysteria that frames modern (online) media discourse in extremes. At the same time, this particular refrain that people were unreasonable in their expectations prior to this game's launch has always, at its core, only been reflective of how fundamentally uninspired KH3 is as a main title. The main lines of criticism targeting it have nothing to do with some alleged (yet never evidenced) overextension in the popular hivemind surrounding its anticipated reconfiguration of the gaming universe: on the contrary, even its
most technically basic shortcomings tend to go largely ignored within the fandom, because what many fans were actually expecting, and what we didn't get, was simply a well-told story. The DLC announcements act as a reminder of what Nomura prioritized as director over the expressed interests of longtime fans, which included such unreasonable demands so far out of alignment with the series' trajectory as, you know, treating his female characters with a modicum of dignity and seeing the key threads running through this narrative get their due by shoring up the central elements that have been with it since its inception (but oops it looks like FF is no longer unique and catchy enough as a marketing device, so cross that off the plotting board).
With that in mind, I'd contend that what caused the lead-up to KH3's launch to become such a circus had more to do with a growing sense of disillusionment among a portion of the fandom married with a couple of "bad actors" who basically served to sew discord within a social grouping that was increasingly at odds with its collective self; many fans were concerned about the indications that were coming from official marketing material, as well as some of Nomura's own (frankly disingenuous) public statements, while other fans expended a lot of energy disputing or discrediting any attempt to scrutinize the available information about the game, which left a huge lane open for certain social media trolls to take ownership of the narrative surrounding what the game would ultimately look like. One which SE (bizarrely) never attempted to reclaim, so that it wasn't an issue of misaligned expectations, but of unreliable information being conveyed from all sides to an invested core block of fans whose confusion and frustration then permeated out to the fringes-- really a kind of proof positive case study of the issues that are endemic to hype culture and spoiler panic, and how those social factors now inform corporate media marketing as an industry unto itself.
That's all to say that there's (obviously) nothing wrong with being excited for these DLC additions (folks don't need my permission or that of any other fan to feel that way). The ones rumored here are basically just mechanical QoL improvements directed at people who already enjoy the game and could use an incentive to replay it. They just don't feel like much in the way of an answer to the mess that has plagued the whole KH3 "era" within the franchise; and yes, that's likely an expectation that is genuinely unrealistic, given that KH3 has been more or less uniquely afflicted by the trifecta of poor conceit, poor presentation, and poor execution.