0.999999999999 is not 1.
0.999999999999... may as well smurfing be 1.

If you need to carry the repeating 9 out a billion places to ensure that errors do not occur in equipment or tests, than do so. But for all practical purposes, we ought to view it as simply 1.

This how I view it, and I will be the first to tell you I am not gifted in mathematics. But from what I would call a logical, practical standpoint, I think my statement is true.