While I am not bungie, I dont believe that scuff controllers are going to net you a restriction especially now that the elite controllers offer similar features.
As for the routers... that I can't speak on. I know they do some kinda lag correction correct? I doubt they do anything malicious as its not increasong lag but stabalizing its own connection but again that will be something I will need to leave to someone more knowledgeable on the topic.
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They do have an algorithm built in that says it basically restricts games down to regional high connection low latency hosting. How it does that would be the questionable issue and could be considered bad form depending on how it interacts with destiny matchmaking.
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