I'm with macropod on this; every time I get into the habit of using unqualified objects, I end up shooting myself in the foot and go back to qualifying everything. Well, almost everything.

On the other hand, this problem tends to be self-correcting. Some day, maybe soon, you'll spend a frustrating hour or whole afternoon trying to figure out why something really simple is producing the wrong results. When you realize what it is, you'll remember what we said. One or two of those and I expect you'll decide it's worth the extra work.