That is a matter of opinions, some might say walls are an intrinsic value. They look very nice in higher levels and they also show the player's commitment to farming but farming them on the cost of defenses is not smart, that is true. Different people value different things, some want to progress rapidly, some want to make their base as strong as possible, some want to make their base just what they want it to be.
I am not attacking you personally, just wanted to voice my opinion which happened to differ from yours

