What? If you want to expose new rich functionality to web apps, you need to do it separately on each platform anyway, whether it's in a plugin or in the core browser. Plugin developers seem to be okay with paying that price. The iPhone doesn't have Flash because Apple doesn't want web developers to make rich apps and divert users from the app store, not because of implementation difficulties.
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Primary argument against plugins is that they have to be remade for every platform. See: the iPhone not having Flash.
What? If you want to expose new rich functionality to web apps, you need to do it separately on each platform anyway, whether it's in a plugin or in the core browser. Plugin developers seem to be okay with paying that price. The iPhone doesn't have Flash because Apple doesn't want web developers to make rich apps and divert users from the app store, not because of implementation difficulties.