My PM wants to take the current website, which really sucks on mobile (one of the worst mobile viewports I have seen) and put in an iOS/Android app.

So basically he wants an iOS/Android app which contains only 1 activity/viewcontroller which contains a webview...

My goodness...

Tried to talk him out of it, but I can't even get him to consider using a hybrid framework.

He doesn't appear to care very much about performance of the app neither does the PM care much about UX.

What the PM does care about is this thing called : ONE CODEBASE.

Any tips how I can try to persuade him to atleast consider a hybrid framework? Any requirements that will force the PM to abandon this stupid idea are extremly welcome!