depends on what you mean by important?
but i wouldnt recco to do 3 pressing moves in one workout..if youre looking for something different do flats/decline one workout then try inclines/declines the following week
I wouldnt worry about doing them....how many people do you see with poor lower chests? not many, most lack uppper chest, focus your attention there. And if you need lower chest development, do dips instead.