What is the purpose of RoutingEffect/PlatformEffect dichotomy?

[bzd3y]

Are these just a hold-over/for use in multi-project apps? Are they still preferred for multi-project apps?

In a single-project app it is easy enough to use partial classes to do the platform-specific implementations. But is that considered bad practice for effects for some reason?

On Android it looks like we can simply use the PlatformEffects without needing a RoutingEffect. But on iOS that doesn't seem to work and causes a crash unless there is a RoutingEffect configured and mapped to the PlatformEffect. And then you can just use the PlatformEffect by itself after that.

I think the main issue is that when using a RoutingEffect, you have no access to the PlatformEffect anywhere in code, and so the PlatformEffect cannot be parameterized at all.