Even if this proves to not be an issue with this Secret Lair, who's to say it won't be an issue the next time they try to do this with an external IP and that it wouldn't involve a card that both isn't legendary and is something that ends up being a four-of staple in numerous decks
While some commanders arent really built to attack, there are a ton of them that do, and if youre playing one of those, you want to find room for this juicy two-mana artifact
When I swung at RC co-founder Gavin Duggan, he blinked it
You know when youre in a pod with your buddy, and it feels like collusion to team up with them or betrayal to attack them
After you've drawn, the appropriate creatures are all simultaneously returned to their owners' hands
Discard already suffers from doing nothing on an empty hand, the fact that Duress can still do little on a full hand means you have to be quite careful how you build with Duress and where