As my friend Chris Lansdown has noted, not only is the “burden of proof” not useful in discussions, it actually renders all discussion and argument impossible, if it is taken seriously.
Consider someone who claims that his opponent has the burden of proof. By his own principle that “the one who claims has the burden of proof,” he has the burden of proof to prove his claim that his opponent has the burden of proof.
Suppose he attempts to do so. In order to prove this, he will have to make an argument. In order to make an argument, he will have to assert other claims, namely, the premises of the argument he offers as a proof.
But in asserting these new claims as premises, he immediately, by his own principle, acquires a burden of proof to prove his claims. So he will need to prove his new claims, the premises, as well.
But to prove his premises, he will need to make an argument for each premise, and every argument he makes will require more still more premises—that is, claims—and with every new claim he asserts, he acquires—by his own “the one who claims has the burden of proof” principle—a new burden of proof to prove each of the new claims.
This very obviously results in an infinite regress, where you have to prove the proof and then prove the proof of the proof and then prove the proof of the proof of the proof etc. ad infinitum. And since this endless task cannot be completed by any human being, it would destroy any meaningful conversation before it even begins.
Thus, literally the ONLY way to have a rational discussion about ANYTHING is to DISREGARD the nonsensical pseudo-logical principle that “the burden of proof is on the one who claims.”