I mean, if you wanted to add no value to GPT, yes. The value of any 'read a pdf' app should be that it traverses the full document as needed for a query, copying into its internal context what may be relevant, re-iterating until the true answer is found regardless of whether it's scattered through the large document. Bing and the OP app both have as author says a "layer" that should do that but currently

- Bing isn't using the layer right - it can search the whole internet to orchestrate context for itself but doesn't seem set-up to so search one doc

- OP app seems to crash after a while

- the third service i forget the name of which has been shown on here (something to do with 'pdf') similarly to Bing doesn't 'search around' in long documents appropriately