Because I’ve already explained it to you and you won’t listen. If you want to be technical Maxy is the first character you meet after Prim and Gia is also one of the first you meet too, but eventually got content when the story got caught up to it.
You could have made your point more clear in saying which characters you were referring to. “Characters at the beginning of the game” can refer to a lot of different characters that is broad and very vague.
In terms of Helena, Daisy, and Celestine they aren’t relevant to the main story at the moment. Helena and Daisy fill the world of Argleton so you can do a couple activities like the book exchange and fishing. They are there to be apart of the world but will get content eventually so I get that there isn’t anything with them currently outside that. Though you can see their houses on the beach so at some point there will be. So you will see them appear in other stories but don’t have content currently because they don’t directly relate much with the main story atm.
I was explaining how side characters support the main characters which Clara does. She also fits to your definition of characters at the beginning though and has content.
With the Liz point I mean technically you can. It’s like when you have a friend and know they will betray you but you still are friends with them anyway. The point was she believed in it because she was trying to grasp at anything to prove to Layla and become her friend. Humans do illogical things. You can’t expect everyone to make perfect decisions as I know you and me definitely haven’t made the best decisions 100% of the time. Why? Because that’s how we grow.
It would have made more sense explaining exactly what you meant rather than assume I understood what characters you were referring to. However while yes characters like Helena and Daisy don’t have content that you see at the beginning because it hasn’t come up for the main story but are there currently because to add to the town. But yes they don’t have anything rn but will get there eventually. While other characters you see at the beginning like Gia and Clara do have content. Like I said, read the progress reports to get a better idea as to how the content is being implemented as it is explained there.