I don't know anyone who has stuck to a strict FODMAP diet long-term.
That's not how the high fodmap issues work. Everyone has some tolerance level for fermentation in their digestive system. These people just have a lower tolerance so the total high FODMAP foods in their diet has to be lowered. You don't have to give up bread, past, etc. You just need to cut things down. And honestly it's usually easier to cut out other things, like certain fruits. The reason it's done by iterative exclusion is because you don't know just how much you need to cut out and it would be really harmful to your life to cut out more than necessary. So you remove one thing at a time until you've cut enough. Generally you start with the foods on the list that are your least favorite and go that way.