Ah sorry, that question was meant for @dcvmnaturalist really.
But yes, the complete absence of a withdraw button on iOS is doubtless another sizeable contributor to the OP’s concerns …and one would think a relatively easy thing to fix.
I put in a feature request for it, but it was rejected as " “Feature parity with Android” is already planned for future iOS development".
I flagged it on this thread though at least… it should be a priority to fix in my opinion.