What are the practical tradeoffs of building a genuinely fully adaptive app supporting both distinct Material and Cupertino widget sets, compared to simply choosing one single consistent design language to use uniformly across both platforms?

Building a genuinely fully adaptive app that displays distinct Material widgets on Android and distinct Cupertino widgets on iOS provides each individual user with an interface that feels the most genuinely native and immediately familiar to their own specific particular platform, but this approach also meaningfully increases your overall development and ongoing testing effort, since you effectively need to properly design, build, and separately test two entirely distinct visual implementations of potentially every single screen, whereas simply choosing one single consistent design language, most commonly Material Design given its excellent overall cross platform support, to use uniformly across both platforms significantly simplifies your overall development effort at the reasonable cost of the resulting interface feeling slightly less than perfectly native specifically to iOS users.

// Fully adaptive: separate widget trees per platform
// Consistent: single Material widget tree used across all platforms