The reason this is a worthwhile point is because it means games on Steam are not automatically DRM-encumbered and the steam apps folder for the game may just work as-is.

How big of a difference this makes definitely depends on the kinds of games you play. Obviously the triple A games on Steam are, with rare exception, DRM'd to the gills. The older games and indie games, a lot less so, sometimes none at all.

You have to check of course, but probably a good idea to do so before trying to find cracked/pirated versions.