If dark souls made the platform with the ladder where archers stand over the bridge (smelter demon? Been a while, early on if you didn't go straight to Havel) inaccessible, many people would likely rage quit there of all places. But the giant can jump onto the tower after a short while- so you can't just arrow spam him or something. Why wouldn't this be an applicable situation to utilize the other towers? Assuming everyone's hunkered down in one spot aka shield man, the Templar could teleport to an adjacent tower incentivizing the group to find better cover. It would give the game more randomized flow, force people to work as a team to mow down the vex while simultaneously killing the boss. Give people a reason to kill the harpies/minions. Perhaps have a side objective to the oracles, of sorts, that would delay either the spawn rate of oracles (briefly) or the likelihood that the Templar tower hops after you. The point is, both platforms are just as strong of assets when fighting the boss- choosing to use them or not is up to the group (or player). Side note- you can kill the demon by making him fall off the bridge. You still have to get there and DO IT, it's never sure fire. A straight b-line to the center isn't a good fix.