Whether to concentrate or to divide your troops, must be decided by circumstances.
There are various rules for deciding whether troops should be spread out or brought together, for example in the need to defend a wide front. Yet in the end, each decision has many complicating factors and must be carefully considered.
In business, we often seem to blindly apply rules because ‘that is what should be done’ and then are surprised when our decisions fail. Yet if we took time to understand and think we might have decided otherwise.