For me, it is easier and more pleasant to sit down with a few catalogs. For instance, I can turn to the cukes section of each one and look back and forth, comparing varieties and prices. I can lay several out on the coffee table at once.
I will admit that Windows 7 did make it easier online by allowing you to put two panes up side by side, but then you are limited to 2.
I am fond of going through my catalogs on the road while my husband is driving. The screen on my smartphone is not quite big enough to show a whole web page and I don't have a tablet or notebook.
Those are basically my reasons. I'm sure somebody else will chime in with other very good reasons.
I have enough leftover seeds from last year that I will not need any new ones this year, though I am looking for a few Creole tomato seeds for this year.