Coulomb force vectorial and non-vectorial forms

[black_kitty]

I must comment on the Coulomb force - vectorial & non-vectorial form:

F=k*((Q1*Q2)/r^2 )
F=k*((Q1*Q2)/r^2 )*[r] >>>[r] unit vector

I know that , in case of vectorial form, I can use superposition principle, and use this form when the direction is important for me.
But what's more?

 

[G01]

But what's more what? I don't understand what your question is.