I'll try again. The issue is quite monumental. But, if you aren't use to thinking about it....it seems too subtle and unimportant.
You said: What does "original" mean but the very first which originates from the hand of the writer?
The "bible", as it was finally accepted in the 4th century is very much "original".
The different codex's ( Siniticus, Vaticanus, Rectus, sorry if I missed any) are pretty old as it is.
The fact that we don't have the original writings from the 1st century of Paul and others is, well, understandable, the frits letters were written to people that one would hardly call "scholars" or "historians" and the chances of them keeping letters very well preserved was probably minimal.
Of course, when Christianity became an organized religion and then an "offical" one, control became the name of the game.
What does "original" mean but the very first which originates from the hand of the writer?
Look at the United States Constitution or the Gettysburg Address as examples of "original".
These documents are preserved because they have a transcendent value over and above replicas.
Ask it another way and see if you can see the importance:
IF a doctor's prescription for a life saving drug is copied by a layperson (or murderer!) and the corrupt copy is given to the Pharmacy;
is there an important difference? Once the patient dies the responsibility for that death cannot be determined UNLESS you compare the slip at the Pharmacy with the Original slip from the Doctor.
A corrupt copy may have corruption deliberately or accidentally. If a thousand hands copy something with a thousand motives---the results will be corruption upon corruption.
Religiion today is a maze...a nightmare...of specific citations of word of scripture interpretations!
If the word is wrong it logically follows the interpretation is wrong!
Jehovah's Witnesses split hairs over the wording of scripture constantly.
How do you prove a word is correct if you HAVE NO EXEMPLAR in the original with which to compare??
You see how vital this issue really is???