Thanks for the 1mbit :) The absolute killer feature for me is multisig with a second party, based on a standard BIP backup seed - so 2 of 3, I hold 2 keys on a paper wallet, the mobile app holds 1 key, the trusted other party holds 1 key, 2 keys are needed to send transactions.

Basically my preference for bitcoin software is like this:

1. If there is a bad update to the software, I feel safe that it doesn't matter too much because there is a secondary signature needed to approve a transfer

2. If the software is discontinued or I want to stop using it, I feel safe it doesn't matter because I can restore from a seed elsewhere

I appreciate safeguards to the device like the touchId etc, however there's a tricky balance there of security vs usability. I think using the touch movement pattern is a great idea for a backup method and touchId can be the primary method.