I won't argue about indoors but if that is true of outdoor battles (and I can't imagine how you could POSSIBLY know that) then most DMs suck. Especially if there is someone like an Archer Ranger in the party. Kinda sucks the fun right out of being a long range damage dealer doesn't it?
IIRC, the 4E DMG recommends to start encounters at a maximum range of 20 squares. And yes, that includes outdoor encounters.
Do DMs who follow the advice in the DMG suck?
Let me tell you a bit about my 3E game in an attempt to answer that question:
I have a ranger player who starts every combat by running away and hiding. He will stay hidden until all of the enemies have been engaged by other pcs. Then he'll start sniping, i.e. releasing a single shot and go back into hiding. Should an enemy get into charging range, he'll retreat to a 'safe' distance again.
Interestingly, all of the other players think, the ranger player sucks. As a DM I fail to see how the player is contributing to the party's success.
I also sometimes let encounters start at a long range. What will happen is this: The enemies get blasted to smithereens before getting close enough to do any (significant) damage. That's because of the spellcasters, mind you, not because of the ranger. Anyway, the melee combatants don't even bother to try to get closer, since the fight will be over in no time anyway. So basically, the encounter is meaningless and I might as well simply award free xp.
There's a third scenario: The party is attacked from a long range with superior firepower from enemies using hit & run tactics.
The combat took several hours to play out. All of the melee combatants were frustrated. Since the spellcasters were soon the main targets they eventually didn't dare to return fire. Out of sympathy since I wanted to get it over with I finally decided to let the enemies approach, despite their superior position.
I think it's safe to say that all players agreed that the encounter sucked.
My conclusion? The DMG advice is good advice.