Doors are they needed?

I've been using D20Pro for awhile now. I was showing one of my friends for to cover maps with fog of war trying to not let the bits of uncovered area's show. He said he got it and started FoW on his map. Afterwards he showed to me, had all the doors set into place, the mask, walls, ect, ect. I asked him why did you add the FoW doors to the doors onto the map? His answer was well they are doors! I mean makes sense right?
It doesn't really though, I mean as long as you have walls drawn out and mask what else do you really need on pre-drawn map? All a door is, is a tiny mask that covers the door area, from what I can tell. Is there actually an advantage to using the doors portion of FoW? I've covered A LOT of maps with FoW now and I think I stopped using the door option on map 2 or so. It doesn't make sense to me to try to line up the door FoW just inside a door so the players can tell there is a door on there end. A straight line mask that covers whatever is on both sides of the door is both easier and quicker. Again am I missing something that a FoW door does or is it old and outdated at this point?

 

I think maybe you miss what I am saying. A door isn't special, it's just another name for a mask. If it acts like a mask and looks like a mask, it's a mask. There is no difference if I draw a thin mask past the wall or use a door. They both do the exact some thing or is there something that separates them from a mask?

 

If their are plans to make the FoW for doors another color, wouldn't that show where ever door you added on the map? All I'm saying is they are small mask that are difficult to click on unless you are zoomed in on them. I guess the one thing they do is block the view of a player on the wrong side of the door if they become closed while players are on both sides of them.
The draw back is they are black FoW (or whatever color you have your FoW set too.) which makes the map in which the player look at difficult to tell the difference from a wall and a door, unless you make that door smaller than the map drawn door, which in turn makes IMO an unnecessary mask which is hard to "click" on.
In all fairness I also don't use independent lighting very often either as I have my screen built into a table and we all sit around it, so I simply light a room when they walk into it. I do think the lighting in very neat though!