Re: The most important question
Not wanting to be controversial, but......
If you are interested in Privacy, why would you want (whatever a) *banking app* (is) on an electronic device?
It seems you are just setting yourself up to be powned.
I don't know you, but your probably aren't worth enough for an attack group to be seriously interested in your finances.
On the other hand, your bank, which is collecting all this juicy info and access, is very likely to be a target for such groups.
So, they exploit your bank, and will find details of you; however, if you have denied all electronic commerce, you are in a better position than so many others.
Fine; rejecting all e-commerce is a stretch, but it isn't if you filter it through a few well defined portals ( visa, paypal, interac-e-xfer ), you can substantially limit your surface.
That isn't a recipe, just a guideline.
I don't think it is exactly a radical message : " Do Not Trust The F-ing Banks "; especially their apps which hold you accountable for their breaches via TOS.