Which would be fine actually for the program itself, if this is all figured out by the compiler/at runtime, though obviously more inefficient "for no good reason".
It would wreak havoc on the programming side though. Have you ever worked on a code base with more than a few people? Have you ever had to deal with different preferences programmers have? Differences in opinion between smart, slightly (or not so slightly) non-social people?
Using 0 or 1 indexed arrays, the new space vs tabs war! Or the new 2 spaces vs. 4 spaces vs. 8 spaces vs. using tabs war!