Make it possible to select the chart x-axis to auto align or always align to zero or always zoom only on the data somewhere in the y axis.
M clark commented
When making a plot, excel has an algorithm that will sometimes show bottom border near the data, and sometimes the bottom border will be at zero. It's impossible to know where the bottom border will be. On the same chart which uses data that varies by a small amount, sometimes the bottom border will be on the zero axis and sometimes, the bottom border of the chart will be near the chart values. Sometimes it's desired to always have the border near the x axis and sometimes it's desired for it to be near the data. Setting the maximum and minimums instead of auto will not work because sometimes the data will be cut off from the chart.