The "sad legacy" is the sad legacy of leftwing historical revisionism about Reagan. No matter how many times it's repeated that Reagan cut tax rates tremendously in 1981, and agreed to an increase based on democrats (unkept) promise of 2 for 1 spending cuts in 1982, and that Reagan was forced to tremendously ramp up the military with its attendant costs because of the aggressive forces loosed in the world because of Carter's appeasement policies, they still want to warp history by portraying Reagan as a spendthrift. This is leftwing strategy right out of the Alinsky manual - when you can't defeat an opponent's issues or reputation, go after him with defamation.
It's not about portraying Reagan as a spendrift. It is about portraying what actually happened during the Reagan years with regards to the economy, whether he wanted it or not. And the result was not lower taxes, less spending, lower deficits, and everything that actually grows an economy. Under Reagan spending (domestic included, not just military) increased, deficits soared, and taxes stayed the same or may have even risen.
I wish Reagan really did succeed in reducing government influence, but he did not. The sad legacy is confusing conservative intentions that sadly never came to fruition with what actually happened.