> Flutter has completely replaced it's rendering engine across all platforms

And that new rendering engine is also why apps like Immich are unable to show HDR photos. Apple & Google both pushed broad support for that a couple years ago, with things like Ultra HDR and subsequently ISO 21496-1.

Meanwhile Flutter still doesn't really have wide gamut support https://github.com/flutter/flutter/issues/189155

Of course they need to prioritize where to spend resources, like any project, but Flutter also doesn't seem to be on any critical path for fancy headlining new features, either.