Yeah I have no doubt that Huey can be helpful, but they can trigger him in those spots to remind you then, I mean they will know which are the common roadblocks when they did testing. Triggering him that often at the start when there is no need for his help is rather pointless.
No, they don't trigger him for hints almost at all after the beginning. He talks about what is happening (plot points and jokes) and gives general directions. That's why he reminds you three times in the beginning, that if you want actual tips, you have to ask for them. It's really good IMO, since you have tips available, but they are not forced on you.
I am completely stuck. There's a blue star in the blue district by the water wheel. I can make a cutout appear, but nothing happens. I just got a pliunger. They want me to find a postman toad. When I ask for advice, I get told "go to the blue district and ask the toads" BUT THEY SAY NOTHING USEFUL. I am so annoyed right now.
To have cutout work, you must align things in the background just right so that they match the outline. In blue district after fixing the bridge, you need to ask the post toad to fix the sign first, and then the cutout will work when you are in the correct position.