I’m not so sure. I sell to the US and demand has dropped significantly, because with the dollar worth less the price (to you) of my products has rocketed. On the other hand, my friend plans to vacation in america next month, at least partly because she can get so many dollars for sterling. That in a nutshell is what this guy is talking about. Weak dollar means you buy less from other nations and they spend more with you. Which is good for the US.
Of course, this is on a macro economic level. I take your point that poor John Doe doesnt get to see much of the benefit of all this.
The average American does not have a diversified portfolio of currencies and precious metals. When the dollar is devalued, their life savings are devalued. With increasing costs in any number of sectors, it means the average working American gets the short end of the stick.
So, where can an American vacation in the world where the dollar can go far? Any ideas?