Why does Jigglypuff get KO'd if her shield breaks? [closed]

Jigglypuff had this feature in every Smash Bros game, not just Brawl onwards.

It has never been officially explained why this features exists. I don't think we'll ever get an offical reason as to why, but hypothesised reasons include:

• She is the balloon Pokemon. Her shield breaking is akin to a balloon popping and resulting in the balloon's loss of life.
• She was intended as a joke character in the original Smash Bros game. This feature may have been part of it, and it got carried over across the games.
• Compensation for her very large shield size relative to her actual size. However, she may have the large shield size because of her shield break feature instead of the other way round.