It is truly cross platform, unlike Swift, has great UI going for it that you can use everywhere and improved greatly as a language in recent years while Swift continued siloing itself in Mac world.

Dart might not break world records for most innovative or performant general purpose language, but it’s a completely different language from 6 years ago.

Pretty much, which I love. Opinionated TL;Dr: Kotlin without the duplicates of Java classes, or 20 different inscrutable functional operators. Swift without the compile times and architecture astronaut stuff that infected stuff built on it and makes apple reinvent it every 2-4 years, c.f. async/SwiftUI. Genuinely cross platform, both in terms of code* and UI** It's indistinguishable from native in the way that's meaningful to users (note it's AOT on not-web, not JIT, and does a bunch of obvious stuff, use the platform text renderer, scollbars, scroll velocity, etc)

* I'm too old now, 36, and you have no idea how much I roll my eyes internally at hopeful invocations of 'man if only Swift was cross platform / look apple did this so swift is coming cross platform. All the "SwiftUI web is clearly coming" wish casting from big names in the Apple dev community who should have known better broke me.

** the mish mash of bad, competing solutions to bringing iOS UI cross Apple platforms forfeits the core premise of an Apple-values inheriting dev: I'm infinitely better off having a base UI engine that renders the same stuff on each platform than a shim that renders and acts differently