I once saw a team full of Suros users that just ran around from point to point together. In my mind that's when the anti-tank rifle deserves to be unleashed. The rest of the time, while I see what you mean, if the enemy team is all going for one point they don't ever need to all be on the objective. Even on Blind Watch's point B, where the point is closed in on almost every side, you could always just have people down the stairs or out the door watching the paths from A and C. There's no point in instacapping if your team opens itself up like that right after, but at the same time you need supers because otherwise a full team like that would just be a war machine and dominate by hexa-teaming any unlucky -blam!-er who comes across it. Which would make the points even less important to winning.