EXACTLY some of the ENERGY supplied by the wrench gets wasted/absorbed in flex and vibration, therefore less energy is used to supply twisting force torque to the nut where its needed grrrrrrrrrrr
The extensions do not create or destroy energy, only change its form. The energy supplied by the wrench is all used (none created or destroyed) but some goes to turn the nut and the other as flex and vibration.
Its the old Physics principle of conservation of energy all over again
Fun chattin with ya
DISCLAIMER this opinion, like all others here, may be right or may be wrong, and Im not saying if it is or it isn't