I think this issue is much less about whether or not the feature physically exists in the game, and much more about what sort of gaming environment you’re creating by doing the thing.
As Kdansky mentioned, a lot of games have borderline-glitchy mechanics, that, while a part of the game you’re given, certainly aren’t intentional. Sometimes, this is awesome: as in the Tribes example, skiing is really fun. It was originally a glitch, but everyone being able to ski around just makes the game neater.
On the other hand, something like SSBM’s Wavedashing quite arguably makes the game less fun. The first time anyone encounters it their response tends to be something like “Well that’s kind of bullshit, isn’t it?” and then they’re faced with a choice wherein they can either stop playing SSBM with strangers or resign themselves to wavedashing themselves through every battle they fight against a “competent” opponent. On the other hand, some people like the mechanic and enjoy fights that involve it.
So, it becomes a question of . . . do we want GSB multiplayer to be a place where every competitive fleet is stacked to a single coordinate? Does that make the game more fun or more interesting? Would it improve the game to know that any given challenge you accept is more than likely to have been hacked to three times its point value 'cause of Invincible Fleet Lawl?
On the other hand, would it create a better multiplayer environment where challenges can be asymmetrical, where challenge creators can post interesting and novel fleet deployments that aren’t competitively balanced, but are hella fun to play against?
Yeah, sure. I’m totally okay with challenges being nonstandard, as long as they aren’t stupid. It really boils down to whether or not you’re doing things in good faith: whether you’re making an honest attempt to be a more novel and interesting player, or whether you’re just trying to give yourself an edge in a manner that makes things way more tedious for everyone else to deal with.