I don't play the market, but one thing I don't understand is constant need for "growth". I mean once you have one of the largest companies in the world how much

I don't play the market, but one thing I don't understand is constant need for "growth". I mean once you have one of the largest companies in the world how much more can you really grow? What is so bad about being good at what you do and making a decent profit. Why is there always so much emphasis on growth strategies? I guess it's all because of wall street.