As a person who at a previous job was often pulled into said "war rooms", we almost never "got that hard problem done", but we did always make management feel good about not being able to fully solve hard problems. Mostly these "huddle-work" scenarios created more problems (long term) than they solved, because people weren't motivated to solve the problem, they were motivated to leave the war room. I do my best work when I'm not constantly distracted by others, but many managers simply can't understand this and instead hamstring their employees by having "war rooms" and white-boarding sessions and stand-ups and deep-dives and all the other nonsensical ways of preventing people from actually focusing and accomplishing a task. Good riddance to the on-location office and all the hot garbo that comes with it; the rest of us will be quietly humming away, getting tasks done and solving major problems without such managerial hindrances.