Casement VS Sliding door... (Continued)...

I doubt most of you would understand what i am trying to explain, maybe we pictures, will give you a brief idea.

Casement door taken from my personal room...

Do you see the slit, it already built with space gap.



Close up space gap...



Now, do you see the door knob flusing against the wall?



Close up door knob flushing against the wall...

I do know the casement door not necessary to have door knob or handles, however, i doubt is easy to open the door.