I think most people are expecting a bigger blowout of game details much closer to release. That's how Nintendo has been doing it this whole generation. The trailer last E3 was clearly meant as a tease to hold people over because they knew people would be asking about the game. I don't think say they were aiming for 2022 was a mistake. They probably sincerely wanted the game to come out this year and were just using very candid language to talk about their target. It's hard to pin down a release date more than a year in advance, especially the ongoing pandemic. That's why he said aiming.
I'll be frank, I think the reason why you and a few other people might feel concerned about the game is just because you're just hungry for more info and want something new to talk about. For me, I've been following gaming news and Nintendo news long enough to know that a lack of news or info doesn't have any real bearing on a game's quality most of the time. Information blowouts have shifted more closer to release. In 2016, Breath of the Wild got its first gameplay demonstration and title at Summer and was supposed to come out in the Fall. The release got pushed to coincide with the Switch but Nintendo had no problems with waiting close to release for the info dump. They are probably going to do the same for this Zelda as well. We'll probably get the name and a new trailer this E3.
I mean, I'm personally not concerned, and I've been following gaming news for most of my life so I do know that there's still a lot to see. I do see why they might have wanted to put the 2022 date, but I don't agree with the decision either, and I think Nintendo would have probably been wise to just not announce the game until they knew it wasn't going to be another 4 year wait between reveal and release.
As for the rest, there is always the possibility that the sequel won't be as 'new' as people hope. I think it's perfectly valid to lean more on that notion rather than assuming that the game is going to have this completely-incredible dimension to it. After all, it's not like people are assuming the game is gonna be crap - just not 'special' in the context of a franchise where every entry is special in its own way. Personally, I think the game's going to have some incredible time-or-dimension-hopping puzzle shenanigans, a slieu of improvements and changes to combat (especially after AoC), and a story that breaks from the "defeat Ganon" formula to become something unique. I think it's going to recontextualise and enlarge the world enough to make its reuse of the same Hyrule much less of a potential problem.. But I still think it's a possibility - same as how I never thought the game was a lock for 2022 - that the game is just what it says on the tin.
And, like I've said, the context here is very different to prior titles. Outside of handhelds there have only been two games in the Zelda series that don't completely 'reset' the world, graphics, etc - and one of them came only a year after its predecessor (and, even then, it gave us an entirely new world to explore). So, by default, the game does not have the inherent 'new' factor that other games enjoyed. It's truly an oddity in the franchise, and as such I think emotions running a little higher than usual is fine. It's really up to Nintendo now to show us what makes this game more than just "more BotW." I expect they will, but I'm not gonna look down on those who can't expect that.
EDIT: I'd also add that, regarding Nintendo's advertisements on the game, the E3 2021 trailer featuring another Talus variant, a new Guardian, as well as the same story content we'd already seen didn't really help things. Like, "there's a new version of the same boss you fought 20 times in the last game!" ain't a selling point to me, and it's weird that they'd feature it in what-was-essentially the game's first actual trailer. But, as we both agree, the E3 trailer will likely show off what makes the game truly special. If it doesn't...
...chaos.
