If I understand your question, you are asking why paper is all along the back of 120 film, instead of only having paper at the beginning and end of the roll. Well, when 120 was introduced, roll film formats were all like that. You had paper to protect the film, and to keep the camera’s simple, they simply put numbers on the backing paper that users would manually wind to.
A lot of the more recent 120 cameras do it automatically. But some, like Holgas and other inexpensive cameras, still use it. Without the paper, the window would ruin the film, which is not good at all. Some people like these types of cameras. I personally don’t, as I find the numbers hard to see.
However, your idea is definitely not unwarranted. There is a rollfilm format with paper only at the ends. It is 220 film. It makes it so that you can fit twice as much film into each roll, but you must have a more complex mechanism for transporting the film, as the red window cannot be used. A lot of people here also miss it, as almost no one is making it at a large scale anymore. And it seems like there are very few people that even bother to make it for themselves.
As for Aviphot 200 and it looking strange, I’m not sure what specifically you mean. I have used it as a normal black and white film, and it looks fine. You could definitely try adding a filter meant to add/reduce contrast of B&W film, but this is a personal taste.
Anyway, hope this answers your questions!