Being all  materialistic is not good thing. But being simple as possible is also not a good thing. The key to this problem lies somewhere in the middle. This balance of wanting stuff, and being happy with what you have is  key to satisfaction. While a "simpler" way may seem nice, its progression is slower. Without the desire for stuff,    a lot of inventions would have never happened. On the other hand, pure materialism will lead to dissatisfaction, because you will never achieve the amount of stuff you want. To be balanced is to be happy