I subscribed to O'Reilly Safari and Packt. They provide web pages and mobile apps. Because I don't own the books so it seems I cannot download them, but the app

I subscribed to O'Reilly Safari and Packt. They provide web pages and mobile apps. Because I don't own the books so it seems I cannot download them, but the apps are not very nice. I would avoid them when I can, so I just use those books as manuals to refer to when I have to read them. On the contrary, I spend quite some money on Manning Publications and Pragprog to buy some PDFs and read through my PDF viewer and I'm pretty happy about it. I know it's not a fair comparison at all, since I didn't buy books from O'Reilly and Packt. But the point is just to illustrate DRM + apps really destroy the experience.