Barring a run chase in the fourth innings, with overs running out, I find it hard to understand run outs in test cricket. Generally, time isn't an issue. Yes, you'll occasionally get outstanding ground fielding that the batsman hasn't expected. But most run outs are usually the batsman taking on the arm of the fielder. Why take the chance?
batsman being run-out is sloppy cricket, also poor technique in batting means you don't fancy facing the bowler, so you are wanting to be at the other