Maybe it has already been said, but one of the reasons why we may see either Bitwig on iOS or support for AUv3 or both, is that many apps that were initially designed on iOS are now universal, meaning they run on M1 Macs. Drambo comes to mind, but many other pieces of software do so too. There is no reason why the opposite should not be true, if we wait a bit more. So it seems sensible that support for Bitwig on iPad may come one day, and that Bitwig supports AUv3. The latter is likely easier to implement.
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