A MethodChannel typo cost us three days and a hotfix release, and the compiler never said a word. That's the whole story of Flutter native interop in one sentence: the easy path is a stringly-typed message bus that fails silently in the field, and almost everyone reaches for it first.
Every Flutter developer's first brush with native code goes the same way. You need something the framework doesn't give you — a battery level, a hardware sensor, a C library your backend team already trusts — and the first search result says MethodChannel. You copy the snippet, wire up a stringly-typed channel name, and it works. Ship it.
Then it grows. Six months later that one channel has fourteen methods, each one a switch on a string, each argument a Map<String, dynamic> you as-cast and pray over. At Shpper we had exactly this: a device channel that had quietly become the single largest source of crash-free-rate regressions in one of our apps. The regression that cost us the three days was a renamed method on the Kotlin side that nobody renamed on the Dart side — green build, green tests, MissingPluginException on real hardware two days after release. Not one of those crashes was catchable by the compiler, because we'd built the boundary out of strings. The lesson I keep relearning: MethodChannel is the default answer and it is usually the wrong one.
