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Similarly one may ask, why do golfers leave the flag in when putting?
The bodies decided on the alteration because they believe "allowing a player to putt with the flagstick in the hole without fear of penalty should generally help speed up play". Before, if a player hit the flagstick with a putt, then they would have been hit with a penalty.
Likewise, can you putt with flag in hole?
Players are not required to putt with the flagstick in the hole; rather, they continue to have the choice to have it removed (which includes having someone attend the flagstick and remove it after the ball is played).
Under the Rules of Golf, a golfer can carry as many golf balls as they want in their bag. Really, they can carry as many golf balls as they're willing to carry around themselves or their caddie is willing to lug around for them. Most PGA Tour golfers carry in the area of nine golf balls in their bag per round.