Hardly. Performance lags. Even after the new rendering engine. Try compiling and then running desk top samples (a mail client, a finance management tool) on macOs and check the amount of jank in animations.
Text fields are whole another story. They feel alien in UX on every platform.
I can live with that but performance is a deal breaker.
Eh, I was recently contracted onto a native macOS team (Swift), the company had an adjacent desktop team who opted to use Flutter, they had a lot of problems and ended up dropping the project. I don't know the details but there was a lot of weird edge cases they ran into on desktop. They had a mobile app partially in Flutter (different team again) which seemed to be OK, however.
The problem with Flutter is that it's a UI framework that relies on a single main thread. If you put something heavy there, you'll get lag. In contrast, other languages like SwiftUI let you easily spawn threads. Flutter dismisses this as outdated and instead promotes an isolated model with completely separate memory... for reasons.
Text fields are whole another story. They feel alien in UX on every platform.
I can live with that but performance is a deal breaker.