I think the most plausible feeling speculation (to me, imo, please don't yell at me fami) is that this was the Switch 2 launch year, it no longer is, and it's taking them a minute to firm up what Plan B is
I'd know we'd like to believe that if Switch 2 isn't coming then instead there'll be a lineup of exciting and hype games that they're taking their time to announce. But I think this wasn't the initial plan, they didn't expect Switch 2 to be 2025, and they can't exactly magically conjure up a slate of Switch 1 games out of nowhere.
That's not me trying to be negative, and I'm not saying nintendoomed or anything. But I do think that when the rest of 2024's lineup is announced it might be lower key, less broadly hyped titles. (Which could very well be good games that sell well, again, please don't get mad at me)