I don't understand that reasoning, 0.5 on a logarithmic base 2 scale would be the next step below 1 on the x axis (0.5, 1, 2, 4, 8), and the y axis already goes

I don't understand that reasoning, 0.5 on a logarithmic base 2 scale would be the next step below 1 on the x axis (0.5, 1, 2, 4, 8), and the y axis already goes to zero anyway.