What??? Can someone translate this?
Now if someone goes after me and they want half loaf, no problem, in E they make red cut and they have they half loaf. But if they want full loaf, they still have to cut half loaf first and then they make green cut to get their full loaf.
This annoys them because they use wedge cut F. If you want half you make blue cut, if you want full loaf you make purple cut. Face of the bread is always flat so you can always make half bread or full bread with single cut.
What you are calling a loaf is actually a "slice". You might cut a loaf into 10 slices, each 10 cm x 10 cm x 2 cm thick. So you the question you are asking is how different people cut a "half slice" of 10 cm x 5 cm x 2 cm. I've never considered cutting a half slice the way you do it.
Personally, if I want a half slice, I would cut it the way you do for a full slice, and then afterward cut it in half while it is laying flat on the cutting board. Then I'd just leave the half slice sitting next to the uncut portion of the loaf.
I'd never cut a half slice the way you show in F, because I almost always want my slices to be the same thickness rather than tapering in thickness from one side to the other. While I wouldn't have cut it the way you do, I prefer your final result.