Broken rocker arms two weekends in a row

I guess what got me started on not backing them off was when I bought my house in 1984 I had a one car garage in the house. I always thought if my car was start ready if there was a fire I could quickly get it out. When I built my shop the practice continued because I never saw any harm from not doing it. Like I said my last set were technically 6 years old with a .650 solid lifter cam. And my present build it over three years old with a .650 lift roller cam. If I saw a maintenance issue from not backing them off I would back them off.