If you want to build a new counting system, Why not use new symbols for all the numbers? I mean the practicality that 1-9 mean the samme when on their own seem

If you want to build a new counting system, Why not use new symbols for all the numbers? I mean the practicality that 1-9 mean the samme when on their own seem completely eclipsed by the fact that any number represented by more than one symbol means something else. It’s like trying to “build a new better C” where everything works “like you’d expect from C” as long as your program is no more than 4 characters long.