You'd be hesitant to trust a brand if it can't keep consistent styling. Branding helps users identify a brand and believe it or not the aesthetics of a brand make a great deal of impact on consumers.

As others have said, your point comes across as "let's remove design who cares" because design and human computer interaction roles stopped where your understanding ends. Everything looks the same to you after all (it doesn't, you just haven't noticed it affecting your decision making).