Yeah but during the Golgoroth fight the bubble is very rarely touching the edge of the pool of reclaimed light unless your Titan is super precise everytime. So typically you walk through a small area where you lose your damage buff if you slowly walk backwards while shooting. And during war priest the same goes for walking out of the aura. You're very rarely in a scenario where the person dropping the bubble is dropping it in exactly the perfect spot that you can walk into without losing a damage buff, but still far away enough that it doesn't interfere with where you team stands to shoot.

If your titan is rarely dropping bubbles in the right spot then they need to step up their bubble game, just sayin.

I don't know about you, but I like minimizing the margin of error when playing cooperatively with a large group. What's worse for a run? Accidentally placing a bubble too far and having to take a split second longer to refill on weapons of light? Or accidentally putting it too close so that everyone doing damage is stuck inside the bubble and can't do any damage at all? Obviously the latter is worse, so we err on the side of caution and tell the Titan to place the bubble back farther to minimize the chances of ruining a run completely.