MBCBP is letting the tax tail wag the dog.

It is a good tactical vehicle for shifting tax burden in the near term (2-5) years. Assuming income tax rates don't move against you, tax savings (hopefully) overcomes the loss to inflation. It's bad for long term investing where beating inflation is required to build wealth. Equities and real estate build wealth much more effectively than fixed returns. The real winner of the MBCBP is the plan administrator who collects a fee for assets under management. If we get the optional plan, I may use it when close to leaving Delta.