iOS 6 is still at 13% usage, and is basically staying there (until iOS 8 comes out, presumably). It would be really nice if you could support just one operating system version back.
When small team ships a product, they have to make tough calls. The reality is that some day very soon, the number of iOS 6 users will be almost zero. Any delay or time spent making the app work on iOS 6 is time that can't be spent on the core features of the app, bug fixes, and (importantly) testing new beta versions of iOS that we know with 100% certainty will be dominant on the platform in the future.
Furthermore, IE8 is nearly five years old, but many of us are still supporting it for users who can't upgrade from XP.
Whereas iOS6 was supplanted less than 6 months ago. And many people are unable to upgrade for hardware reasons.
Of course a team has to make "tough calls". But that doesn't mean people still using iOS6 can't inquire about it. And sometimes, supporting a previous version doesn't even require that much work -- it depends on the particular set of functionality.
We wanted to support iOS6, but the updates they made to the audio backend in iOS7 were important as we developed so it's kind of locked in at this point. I'll double-check, just in case...
I just tried purchasing Fiddlewax before I found out it was iOS7 only. I would upgrade iOS, but I'm hoping Quasar (Cydia multitasking app) makes it to iOS6. If I give up on that, expect a purchase from me.
iOS 7 is a minor update (beside major OS-theme changes). I prefer the iOS 6 look&feel and will stay with that version til several UI bugs in v7 are finally fixed ..so probably with iOS 8.
"It was also evident that the touch and audio latency on iOS were much faster than we could get with other mobile devices. Additionally, iOS devices are fairly standardized, reducing the number of edge cases to debug (previous experience with Warmly highlighted that trickiness with over 2000 Android devices to consider/debug)."
I'd really like it to work on Android myself, but it's a serious wrestling match with low-latency audio apps. The Android devs are working hard to speed things up, so fingers-crossed it'll be just around the corner.