Well, one would of course hedge bets and reach farther by going for multiple platforms. But the whole point was that the Daily (and most iPad magazines) mostly go for a "PDF with bells and whistles" approach, and it is exactly that which makes the product poor in usability. PDF is the lowest common denominator, and also the worst in usability and value. But it shouldn't be to difficult to deliver a lean iPad App AND a PDF for those who wants.
Yes, if they want a classical publishing style in digital form - let them simply ship PDF which anyone can use wherever they want to. And if they want some interactive "bells and whistles" they should better use the web for that. Also many publishers are plagued with DRM paranoia, and instead of shipping their content in various forms they choose some awkward limited mechanism which requires device/tool X to read it.