You worry too much, as I said there are WAYS to buffed or nerfed shields. Personal shield boosters wouldn’t last, because it DECAYS. Shield gen only had a 50 meters if you stayed in the area, and it will last until the shield gen is destroyed. Tracer and genji could still be killed. Was genji or tracer ever unkillable when brigitte give them a repair pack? To me it depends, if the enemy were targeting them.