In environments where missing deadlines can have huge cascading effects it isn't unheard of to do redundant work so that you have a better shot of meeting your

In environments where missing deadlines can have huge cascading effects it isn't unheard of to do redundant work so that you have a better shot of meeting your deadline and in a good case you have multiple successful options to pick from. When your deadlines are potentially expensive enough (think capital investment that need to be bought in time to be built out before old ones become uneconomical to operate) this approach can be well worth it.