While it's true that the early BBB tournaments saw most teams with an inside attack, the strongest commonality was overall good defense.
For teams starting out, it is likely that they will focus on either inside or outside due to training. For long term plans, it makes more sense to finish training the inside or outside players instead of making both mediocre. There may be some short-term losses as a result of lower predictability, but in the long-run, the team will be much stronger.