It's completely okay to be critical of things you love.
It's also okay to be critical of things you've yet to watch/play/etc. Why? Because we live in an age where if I want to find out if I'll enjoy a game I can always look up lets plays and reviews online and literally see what its like and how it plays. And since data-mining has already started from what I can tell, we can further see what is/is not in the game as of the current update status.
While I don't feel the game is incomplete (they would not be releasing it in a state they felt was not complete enough to be a game), I will still question decisions they made. Not having gyroids, while not a big deal to me since I rarely put them up as furniture, is still a strange and unpleasant change considering for every game prior they have been present since day 1. I feel the same over the fact that from what I've seen, paintings are no longer part of the museum. While collecting them all was a pain, I loved how the art section of the museum had expanded to statues as well as paintings. I'll miss them, and also worry what Redd will even do now (if he's in the game at all) if its not to sell art.
I'm somewhat iffy on the holidays as updates, regardless of if they're free or not. But only on a conditional basis. That condition is whether or not the update permanently adds said holiday to the roster of yearly events and it doesn't cease to exist once a new update happens. Basically, I want the holiday updates to simply be adding features to the game as compared to being mobile or mmo like timed events that you have no access to if you purchase the game, say, 10 years from now. If these holidays as updates work as a way for the events to be developed and fine tuned properly after the game comes out before the holiday happens itself that's fine. But if we're gonna rely on them continuing to update the game so I can have Halloween every year you bet your bottom I'm gonna be critical of their decisions. I like not missing out on features for video games because I discovered it and started playing years after the people were actively updating it.
I'm waiting with a positive attitude for the most part. But I am very cautious and open to criticism. Nothing's perfect, especially not Nintendo or any other company. People play these games for many different reasons, and in many different ways. There's no reason to tell someone they can't be upset about something unless the thing they're currently upset or worried about has already proven to be untrue.
Also humans gonna complain and fuss over things. It's sort of what we do. *shrug*