Flutter apps don't look or work like native apps, and the only people who will put up with that are people who have to do so because their enterprise mandates it. Flutter apps have horrible battery performance. Flutter apps are always at least six months behind what is possible with native toolkits and SDKs. Flutter apps use a language that literally no one other than Sass or Flutter developers actually want to use and that offers exactly no benefit over the dozens of other possible languages out there.

Flutter is Java Swing, but worse in pretty much every way.