Seems like the benefits of mass and rigidity, to whatever degree they are so, or were ever an issue for the various iterations of the VSMs, has been known, or should have been known, for a long time, why implement that now? Whereas the Dueland seems to be the implementation of something that was not possible before, till Bobby found and realized signficant improvement in these capacitors - a new technology, that simply was never avaiable before. That is an upgrade that makes sense to me, and one that was not available during the previous 20 years of the VSMs evolution.