The bubble is fine.
The problem is there is no use for what it does anymore.
It’s support function have been given to Warlocks (rifts, Well of Radiance), and there is no need for its power to let you defend a specific spot.
In fact Bungie has designed things such that the game usually punishes you for trying to play that way.
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If it has no use then it's not fine.
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That’s a design problem, not a problem with the super. Bungie’s over-reliance on making you fight in an inescapable box or on an open platform with a mobile boss that can ground-pound you to death.
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No, even if these things were addressed if there's any cover whatsoever then it makes it almost completely useless. Titans already have the ability to create a decent amount of cover with tower barrier; it needs to have something other than being a glorified Titan barrier. Otherwise you're better off just sticking to Sunbreaker for melting point.