The point is to win debate tournaments. In particular, it is (or at least was, when I competed in policy debate in high school and college in the 00s) strategically advantageous to maximize the number of distinct arguments, each with their own set of supporting evidence (usually read verbatim from a prepared excerpt of a news article or authoritative reference or whatever), you make within the allocated time. This incentivizes talking extremely quickly, which requires a fair bit of practice to become proficient at (and to understand).

These students are probably intellectually gifted, they're just playing a stupid game for the sake of an item on their resume.

It is quite strange. One would think a judge would easily throw this out.

I mean there is probably not a specific rule I could point to that a high school athlete couldn't ride a bike or a motorcycle in a 400m track run either.

There is probably not a specific rule that you can't shoot the shot put out of a canon either.

I would just assume the judges have the slightest bit of common sense.