They always seem to have very little or no writing on them and look the better for it. There, I said it.
Whilst I agree with everything you say here I actually find that modern bikes do look a lot prettier than they did some 5 years ago. rewind 20 years and some of the older frames have a simplistic beauty of their own but I do see how all the bling has an appeal.
When you search for a bike to buy (as a newcommer) its very tempting to see the latest cube (or whatever) with all its stickers & branded aero rims and think "wow, that's a smashing looking beast"...but when you get it home and out on the road it feels slightly overdressed and fussy.
thing is, by then Cube have already made the sale.
So perhaps they have it right, after all the sales figure must drive the designs.