[Edxu]

I don't think it's fair to say that the drawbridge "ruins gameplay". It's part of the game as a challenge for teams to overcome. If all teams agree to not pick drawbridge, it's a stone's skip away from people always picking rough terrain/moat/portcullis/sally port every match, and suddenly a huge number of teams who designed their robots to cross the more difficult defenses are deemed worthless, despite being more versatile.

An important part of the game is finding out how best to set up the outer works in order to defend their towers. If I see that none of the opposing alliance robots are able to cross the drawbridge, you can bet that I'll request the Drawbridge. I would even argue that colluding with the opposing alliance or agreeing to collude to make defenses easier would be violations of T7 and T8 in and of themselves.

This isn't Recycle Rush. You are actually obligated to try and win every single match that you play in with the return of the W-L system, and colluding with the opposing alliance runs counter to that idea. If the Drawbridge or the Ramparts are the hardest for the opposing alliance, by all means pick that defense.