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by aguynamedrich 5140 days ago
Tricky, but not impossible. The same as you would have to learn the API's and general usage patterns of new features, you just have to learn how to use the compatibility package or third party libraries like ActionBarSherlock to take advantage of the most common new features.

That said, I don't fully agree with the OP's argument. Fragmentation is a very real pain in a lot of subtle unexpected areas (mostly UI related).