Sure but how many could you fit in your pocket?

You could also carry your rolodex, watch, calculator, etc in your pocket - but those things have been pretty much moved to your phone and the net as well.

They have to varying degrees moved to my phone - with the exception of my watch. To the extent they are digital and not physical, they moved to my phone from my computer not my pocket.

With the exception of the rolodex, none are on the net - and the rolodex is only on the net because that's required for syncing my computer and phone.

The big advantage of a stack of notecards over iNotecards is that physical cards can be rearranged added to and edited easily, directly and without an internet connection. This may make them better to their purpose, which is as a teaching tool not as an object to be efficiently managed.

Don't get me wrong, there may be a place for digital notecards - but low tech may be the best answer for most situations.