I do understand why 1 and 0 are used and why we have to make two states for data transfer storage and the rest. And why those two symbols and not off and on or some other means. It was most efficient and simple.
I already answered this in a previous question of yours. We use one and zero because we do math with it. You can call the states something else like A and B but it is difficult to do math like that. We try not to use things like HI/LO and ON/OFF because it fixes the logical interpretations to a physical representation which might change from system to system. Some systems might interpret ON/OFF as ONE/ZERO but others might interpret OFF/ON as ZERO/ONE.
My quarrel is that 0 does not represent 0 volts but represents a range of lowest voltages or a range of falling voltages as it has a clear verticle component no matter what system is used to show it. the point is it is a range of values and not 0. If we use positive/negative phase or half of a phase or any other system makes no difference. I have never seen 0 volts in any graphs to represent 0. 0 volts one way or another has a verticle component. If 0 really is 0 volts, it would be the time axis itself because that is where we represent 0 volts and our instruments are on our side as the evidence.
I also answered this in a previous questions of yours. Logic zero does not have to a low voltage range. It can be whatever the system designer wants it to be. Furthermore, logic zero cannot be made to work in reality if you define it as 0V because that means you are defining it as exactly 0V.
We use a range of voltages is because nothing in real life is ever exact. If I tell you to send me a 0V signal when you are ready, I am going to be waiting forever as while you hopelessly and repeatedly send voltages just below 0V and just above 0V over and over again without ever sending one that is exactly 0V.
In actuality 1 also represents a range of highest voltages (plural) no matter what system we use. They both 0 and 1 have a verticle line ( a leaning one implying gradual) But my main quarrel is with 0 because it means off. By consensus off means, nothing equivalent to transmission lines being down, the instrument is off.
Again, 1 does not have to represent the highest voltage range we are using. The system designer can make any voltage range map to logic 1.
You seem to have trouble believing that it is impossible to communicate when one of your communication symbols shares the same state as when the system is off, but you do it every day.
Think about this: When someone is speaking to you on the phone, the person has silences between each word. Do you think they hung up every time there is a silence? Of course not. Why not? Because it falls into the expectations of communication protocol you are using. The language you are using sets rules and expectations for what has meaning. If the silence lasts too long to have any meaning in the language then you might determine that the connection was lost. This is the same as a timeout in an electronic system.
If the other person starts making garbled noises that do not follow the rules or have any meaning in the language, you know the line is disrupted and you ignore what was said and might try to ask them to repeat what they said. This is the similar to a retry acknowledgement in an communication system.
Electronic systems also have languages (communication protocols). There are fixed ways to begin and end messages, messages have fixed lengths, and if they don't then the length of the entire message is sent somewhere near the beginning of the message so the system know what to expect.
You could make it so your signal states are unique from the system's off state, but this requires more hardware. Sometimes this is done, but often times it is not because you simply don't need it because the communication protocol and rules sets expectations for what a valid communication is.