I think adding shade really brings the drawing to life. It also adds good detail, I just think drawings generally look better when shaded.
Some drawings look really good without, but they would look even better with shade.

yes I do, but I'm not so good at it

depends on the style i choose to do

usually depends if i feel like it or not

usually cuz my drawings look like crap if i dont.
unless it's a sketch or idk

no because it's a bother

Yes because if I don't it'll look flat and I'm not good at drawing flat things o.o

not usually, because i'm super lazy.

depends if im just doing flat colored, shading or valuing.

Shading's are detail
Color is detail
Highlights are detail
sketch is detail