Are layouts, colors, and typography the most important aspects of graphic design?

Yes, I think. Visual hierarchy and white space should be included in layouts.

I think its a combination of the elements listed however, sometimes 'design thinking' heralds some consideration as well.

Definetly!!! Layouts, colors and typography is very important in graphic designing. 

For me, a concept is the most important.

Yes, they are part of important aspects but you knowing all these three cannot guarantee you being a good designer

yes because they are the main elements for any design

yes, and a little bit of creativity will do wonders.

yes! layouts, colours and typography are the most important aspects of graphic design

yes, these components are very important for a good composition.