Sandra. I hear you, and that's good advice for people living permanently within a single currency area. But not otherwise. I am one of those who suspects there are serious currency problems just down the road, including currency-controls. I am old enough to remember when currency-controls existed in Australia and Britain. Then, it made sense to have money beyond the reach of those nations' authorities. I think the limit was 50 pounds, for British people who travelled outside the country. PARAGRAPH HERE; I DON'T KNOW HOW TO MAKE PARAGRAPHS ON THIS SITE!
It also may be prudent - depending on one's plans, and one's situation - to hold money in different currencies. My wife and I are retired, so we're not tied to jobs - and that colours my thinking. But there may be others in this forum who are in the same situation. (I've no idea!)