Another reason I may need power tools assistance is the thing no one wants to admit: wear and tear on my hands permanently damaged from 11+ years using 60-80 pound jackhammers and hammer drills with 2" drill bits hitting unseen rebar in concrete and the drill trying to rip my thumbs off. Did that until I was 46. The permanent large calcium deposits in my hands below my thumbs make it impossible for me to hold tools the same as if my hands were shaped as originally designed. Don't get me wrong, I'm not crippled but I recognize the drag on labor time this could create. Maybe I'm over-analyzing again but I like to plan for every contingency.