Time zones are how customers and businesses are synchronized, if they are not immediate neighbors. Time zones are a result of the invention of telegraphs and railways, for the first time making it necessary to know the local time of people you can't just walk over and ask. And as long as you don't abolish long distance communication and travel, the need for time zones will continue.
DST is for countries outside the Tropics, where the time of Sunrise and Dawn differs greatly between the saisons.
It makes sense for Brazil to have no DST. It makes sense for Minnesota to have it.
He: Let's end it all, bequeathin' our brains to science. She: What?!? Science got enough trouble with their OWN brains. -- Walt Kelly