The app can handle random factors like the dice rolls and the cards which are built into it.
I'm a purely analog girl myself, but fortunately I don't have to pay international shipping on this KS. I've had to pay my dues on others though.
I also remain a supporter of physical components at the game table, pdf's are OK to read and familiarise yourself with rules but for play only a hardcopy will do.
Cards as part of the app will presumably work for those who like that sort of thing, but unless they are included as separate files that can be extracted and printed off you are tied to using the app (which is of no interest to me).
Generally the pdf version of a game is a complete "Print your own" version, this one does not seem so.
IMHO the great advantage of a PYO version of games is that you can chop out all the fluff and generally second rate fiction and just print the useful rule stuff.