Roughly speaking, 1.2900 is the 50% Fibonacci number between (1.2655, 1.3135).
But I am not dogmatic about that, just a tool ! No majic number indeed !
Quite subjective , if you begin at 1.2650.
Well 1.2900 is the golden number indeed ! (1.2650, 1.3150), A rule of Thumb.
There are weapons in the arsenal. Using suitable tools at the right moment is more important.
: art and science !