Danny- maybe the 150 is only for a fringe putt but it quite often will default to a 30 or 60 on less than a 15 foot putt. For the recreational player who doesn't take it as seriously as some of the serious gamers here it is very frustrating to hit an 8 foot putt off the far side of the green because the caddy set them up for it. There is absolutely no reason that the 60 should even come up for a shot that short.
Certain areas of this game can gain by adding a level of consistency. I'm fine with the caddy suggesting a wrong club. It happens a lot. No caddy is going to suggest that you hit an 8 foot putt with 60 feet of power.
Sure, a shorter swing is available to us with a Putter Pal or the like but I would suggest that the vast majority of players registered here are occasional players and not using such aids. A default to the shortest setting on putts makes it a little easier on them and I don't see much, if any, of a downside to it.