I don't know why the OP need native pickers, but from my perspective iOS users expect consistency and don't understand why an iOS app would not use native pickers as probably 99% of all apps do. iOS users basically don't care about developer considerations and CN1 limitations. I had this feedback from early tests of my app. Not sure if absence of native pickers is make-or-break issue, but definitely an app doesn't score any points from it.
And personally, I hadn't even realized they had been deprecated on iOS.
There are also a couple of other differences/regressions between native iOS apps and CN1 apps I've noticed: no (working) support for scroll-to-top when tapping status bar, not possible to select displayed text for copy/paste or Look Up, different feel of 'tensile' dynamics (eg bounce on scroll to top/bottom).