Dollar devaluation is good for exporters, but not too good for consumers or non-exporting businesses.
Petroleum is necessary for all kinds of things in the economy, and its price is not determined domestically. It’s determined internationally, and the relative value of currencies matter a lot. For example, two summers ago when oil prices peaked at around $140, its “real” cost in Euros (compared to the relative value of the dollar to the Euro at the dollar’s peak) was only about $70.
And petroleum is not the only necessary raw material import.
So, with dollar devaluation, it becomes more difficult for American businesses to compete, not in overseas sales, but in overseas purchases, and it becomes more difficult for individuals to live with the international cost increases of things like petroleum, copper, nickel, etc, etc, etc, because they increase the cost of every good and service sold in America.
One could say it wouldn’t matter too much if everything went up at the same time; wages, etc. But usually wages don’t. In any event, is it really going to help a person who finds himself in a higher tax bracket simply because of wage inflation, even if wage inflation keeps pace with raw material price inflation? No, it doesn’t. And, of course, it doesn’t help him at all if his interest rates on borrowed money go to 20% or higher because the U.S. debt is hard to “sell” either to foreigners or domestically without a huge interest premium.
If the “market rate” for interest on Euros or the Yen is, say, 5%, equivalent value paid on dollar debt might have to be several times that.
The only people who benefit from dollar devaluation other than exporters are those who have fixed rate, low-interest mortgages, but no other debt, and who keep their jobs, but don’t get “inflated” into higher tax brackets. That would not be most of us.