I beat Titan hard. I earned my relic. I didn't die. But what I had to do to survive was probably not how it was 'intended' to work... I would watch the move BEFORE Weight and literally count "One, two, three... MOVE" and I'd start running before it spawned. Just as I'd start moving, weight would spawn where I WAS standing (I'd be on the edge of it when it spawned -- giving me enough time to get out safely.) In phase 5, this sort of planning is absolutely necessary. In most groups I've been in, everyone gathers together for stomp so the healers can easily AoE heal it. Then, weight will immediately follow (or bombs/landslide followed by mountain buster and THEN weight)... If the party members were prepared for it, we could all run out of the center to the safe outer-edges with all the weights being stacked in the center. If people move too late, they will die to a venn diagram of death. If people move too soon, they will drop weights on the few 'safe' spots people intend to run to. You really DO need to memorize exactly where weights come in the ability rotation or you are going to be in trouble. THAT is probably intended -- but the needing to move beforehand? Probably not.
