Encounter hasn't meant "combat" for decades.
It was some other posters who introduced the notion that
encounter implies
combat. And therefore suggested that "bypassing an encounter" means
not fighting the encountered/observed beings.
3e lists 7 or 8 different encounter types I think.
I certainly see a trap as an encounter.
This seems to be a departure from classic D&D usage - for instance, Gygax's PHB has a heading "Traps, Tricks and Encounters" and explains encounters in terms of
monsters, either randomly generated
wandering monsters or
"set" encounters where the PCs encounter "a creature where it has been placed by the referee".
But in Gygax's AD&D there is no need to have any sort of clear or technical notion of an encounter, because the concept doesn't play a role in dungeon design, or in resolution, or in XP award (XP being awarded for killing creatures, capturing them and/or ransoming them, and taking treasure out of the dungeon).
You don't get to brush off people giving XP for bypassing an encounter as something "heavily DM driven." People can and I'm positive do do that in D&D play that is not heavily DM driven. XP for things other than combat is fairly common now.
This makes no sense to me in multiple ways.
First, who is suggesting some crucial connection between XP and combat? I've quoted the AD&D XP rules multiple times now, and as is well known the bulk of XP in AD&D (and other versions of classic D&D) is earned for taking loot out of the dungeon. I've also quoted the 4e D&D XP rules multiple times, and as should be well known, 4e D&D awards XP for combat, for skill challenges, for quests and (if the DMG2 option is used) for free roleplaying that drives things forward.
Second, if "encounters" are not just about combat, then why are you implying that doing something other than fighting counts as "bypassing" an encounter? That seems contradictory, or at least to be in some degree of tension.
Third, and reiterating what I posted, if the "encounter" that is "bypassed" is purely something in the imagination of the GM, and the GM is awarding XP for the players making decisions whose significance, in "bypassing" the "encounter", exists only in the GM's mind, then how is that anything
but a GM-driven - or, if you prefer, GM-centric - approach to play?