Perhaps. Looking at it from another perspective, Brutal+ is when you want an additional challenge that you have a good chance of failing. Even Brutal+1 has a chance of randomising a combination that makes the mission almost impossible to complete. For example, a Karax and Tychus pair enter Temple of the Past, and they end up randomising Double-Edged, Eminent Domain and Orbital Strike. Those 3 mutators are considered relatively low difficulty individually, but combined, heavy hitters and splash damage units commit suicide and static defence quickly turns against you.