Many a times new developers are not aware about a little secret regarding apple apps and that secret is regarding the apples review policy.
Bottom line: It dosen't matter what your client feels abut the working flow of the app or what your QA feels in the end it has to go through the apple review process and if apple finds out that your app is going against their review guidelines then they will reject your app with a sweet mail to you and the reason for rejection.
So here's a PDF that i downloaded from apple will guide you through the entire process and will help you out in understanding apple's review process.
Hope after reading the PDF you would understand what is better for your application, if required you can share this PDF with your client so that even he/she too gets an idea regarding this.
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Happy iCoding and have a great day.