I use my wand for home defense, since that's what the Hogwarts founders intended. Four Death Eaters break into my house.
"What the devil?" As I grab my witch's hat and fir wood wand. Blow a Galleon-sized hole through the first man with a lightning spell, he's dead on the spot.
Cast transfiguration on the second man, miss him entirely because my old hands shake and transfigure the neighbor's dog.
I have to resort to the stairs to cast Fiendfyre from a safe distance. "Tally ho, lads!" The devilish flames leave no trace of two men. The sound and extra flame set off broom alarms.
Point the sharpened end forward and charge the last terrified rapscallion. He bleeds out waiting on the Aurors to arrive since I work my wand better than a triangular bayonet.
Just as the Hogwarts founders intended.