Then on top that you’d have the complexity of shipping a cross-platform app and either building large parts of it twice or using something like Flutter or React Native.
It must be annoying for Android users but the reality is that shipping an audio app for Android is (or was a couple of years ago at least) a huge challenge and probably much harder to make a compelling business case for.
WebAudio has similar issues in terms of wildly varying performance across devices (it used to be pretty poor on iOS for example, though I think this has improved) and relative to native, you’re pretty limited in terms of processing power. Again this is improving all the time, but I’d guess Note has a cut down version of Ableton’s synth engines and effects running rather than remaking them for the app, and running something of this complexity with WebAudio is likely to be very challenging if not impossible, especially on mobile.
