Pete, it's not "lazy", it's the PERCENTAGES against a particular player! PERCENTAGES ARE NOT ABSOLUTES! Why in hell will I attempt to get out of a tough layout when I can cynch the win BEFORE I run out??? If the opponent is a weak kicker, or has no concept of strategy, or shotmaking, etc., why would you possibly even allow for the slightest chance of a failed runout??? That's the #1 sin in 8 ball --- and that's why many strong players don't like 8 ball, I guess. They don't want to STACK UP their percentages... if they have a 60% layout they'll go for it, despite the fact that they could have made it 95% or so against a weak player by manufacturing a break ball or keyball, etc. with a couple aggressive safeties.
Against a strong opponent, however, all bets are off because turning the table over is risky REGARDLESS of how well you think you got 'em locked up.