The Senkens are based on thievery in the same way that Martial Arts Tea Ceremony is based on Tea Ceremony. That is to say, they draw inspiration and a few core principles from thievery, but are ultimately their own thing, and if they're useful in actual thievery it's purely incidental. It's the exact opposite of Martial Arts Dining, which uses the principles of martial arts to enhance speed eating but is entirely useless in a fight.There's no official reason why Genma actually sealed them away, but it is official that they're based off of thievery. If I remember the arc well enough, Ranma actually comes to that realization on his own before Genma admits it. Though you're right that Genma isn't the kind of person who'd stop using it just because it's based off of burglary, Ranma is. That kid's pride is the stuff of legends.
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